Lucius Caviola

Utilitarianism says that we should maximize aggregate well-being, impartially considered. But utilitarians that try to apply this principle will encounter many psychological obstacles, ranging from selfishness to moral biases to limits to epistemic and instrumental rationality. To overcome the most important of these obstacles, utilitarians should cultivate a number of virtues. These virtues are selected based on two criteria. First, the virtues should be impactful: they should greatly increase your impact (according to utilitarian standards) if you acquire them. Second, the virtues should be acquirable: they should be psychologically realistic to acquire. These criteria yield that utilitarians should prioritize six virtues: moderate altruism, moral expansiveness, effectiveness-focus, truth-seeking, collaborativeness, and determination. The chapter ends with a discussion of how these virtues compare with standard conceptions of utilitarianism as well as with common sense morality.

Recent medical research involving human-monkey chimeras, human brain organoids in rats, and the transplantation of a gene-edited pig heart and gene-edited pig kidneys in living human beings have intensified the debate about whether we should create human-animal chimeras for biomedical purposes and, if so, how we should treat them. Influential views in the debate frequently appeal to assumptions regarding how people will react to such chimeras. It has, for example, been argued that the most important objection against creating such chimeras is that this will result in inexorable moral confusion about species boundaries and will, as a result, threaten the social order. But is this indeed the case? We conducted three empirical studies to examine laypeople’s views on the creation and treatment of various types of human-animal chimeras. Our studies indicate that laypeople find typical cases of xenotransplantation (i.e., the transplantation of an animal organ into a human patient) morally unproblematic. They assign the same moral status to humans with animal organs as to non-chimeric humans. By contrast, they sometimes (but not always) assign slightly higher moral status to animals with human organs than to non-chimeric animals. Overall, however, there is little indication of chimera technology blurring the line between humans and animals, and thus of the technology causing moral confusion.

This report presents findings from an expert survey on digital minds takeoff scenarios. The survey was conducted in early 2025 with 67 experts in digital minds research, AI research, philosophy, forecasting, and related fields. Participants provided probabilistic forecasts and qualitative reasoning on the development, characteristics, and societal impact of digital minds, that is, computer systems capable of subjective experience. Experts assigned high probability to digital minds being possible in principle (median 90%) and being created this century (65% by 2100), with a non-negligible probability of emergence by 2030 (20%). Many anticipated rapid growth in digital mind welfare capacity, with collective welfare capacity potentially matching that of billions of humans within a decade after the creation of the first digital mind. Participants also expected widespread claims from digital minds regarding their consciousness and rights, and predicted substantial societal disagreement over their existence and moral interests. Views diverged on whether digital mind welfare will be net positive or negative. These findings provide evidence that bears on the extent to which preparing the world for the potential arrival of digital minds should be a priority across domains such as research and governance. However, these findings should be interpreted cautiously in light of the potential for systematic overrepresentation of experts who deem digital minds particularly likely or important.

Many parents are hesitant about, or face motivational barriers to, vaccinating their children. In this paper, we propose a type of vaccination policy that could be implemented either in addition to coercive vaccination or as an alternative to it in order to increase paediatric vaccination uptake in a non-coercive way. We propose the use of vaccination nudges that exploit the very same decision biases that often undermine vaccination uptake. In particular, we propose a policy under which children would be vaccinated at school or day-care by default, without requiring parental authorization, but with parents retaining the right to opt their children out of vaccination. We show that such a policy is likely to be effective, at least in cases in which non-vaccination is due to practical obstacles, rather than to strong beliefs about vaccines, ethically acceptable and less controversial than some alternatives because it is not coercive and affects individual autonomy only in a morally unproblematic way, and likely to receive support from the UK public, on the basis of original empirical research we have conducted on the lay public.

Prior work has established that laypeople do not consistently treat moral questions as being objectively true or as merely true relative to different perspectives. Rather, these metaethical judgments vary dramatically across moral issues and in response to different social influences. We offer a potential explanation by examining how objectivists and relativists are evaluated in different contexts. We provide evidence for a novel account of metaethical judgments as signaling tolerance or intolerance of disagreement. The social implications of signaling tolerance or intolerance in different contexts may motivate different metaethical judgments. Study 1 finds that relativists are perceived as more tolerant, empathic, having superior moral character, and as more desirable as social partners than objectivists. Study 2 replicates these findings with a within-participants design and also shows that objectivists are perceived as more morally serious than relativists. Study 3 examines evaluations of objectivists and relativists regarding concrete moral issues, finding these results vary across situations of moral agreement and disagreement. Study 4 finds that participants' metaethical stances likewise vary when responding in the way they think would make a person who agrees or disagrees with them evaluate them more positively. However, in Study 5, we find no effect on metaethical judgment of telling participants they will be evaluated by a person who agrees or disagrees with them, which suggests either a failure to induce reputational concerns or a more limited influence of reputational considerations on metaethical judgments, despite strong effects on social evaluation.

Research into cognitive biases that impair human judgment has mostly been applied to the area of economic decision-making. Ethical decision-making has been comparatively neglected. Since ethical decisions often involve very high individual as well as collective stakes, analyzing how cognitive biases affect them can be expected to yield important results. In this theoretical article, we consider the ethical debate about cognitive enhancement and suggest a number of cognitive biases that are likely to affect moral intuitions and judgments about CE: status quo bias, loss aversion, risk aversion, omission bias, scope insensitivity, nature bias, and optimistic bias. We find that there are more well-documented biases that are likely to cause irrational aversion to CE than biases in the opposite direction. This suggests that common attitudes about CE are predominantly negatively biased. Within this new perspective, we hope that subsequent research will be able to elaborate this hypothesis and develop effective de-biasing techniques that can help increase the rationality of the public CE debate and thus improve our ethical decision-making.

Recent research has relied on trolley-type sacrificial moral dilemmas to study utilitarian versus nonutili- tarian modes of moral decision-making. This research has generated important insights into people’s attitudes toward instrumental harm—that is, the sacrifice of an individual to save a greater number. But this approach also has serious limitations. Most notably, it ignores the positive, altruistic core of utilitarianism, which is characterized by impartial concern for the well-being of everyone, whether near or far. Here, we develop, refine, and validate a new scale—the Oxford Utilitarianism Scale—to dissociate individual differences in the ‘negative’ (permissive attitude toward instrumental harm) and ‘positive’ (impartial concern for the greater good) dimensions of utilitarian thinking as manifested in the general population. We show that these are two independent dimensions of proto-utilitarian tendencies in the lay population, each exhibiting a distinct psychological profile. Empathic concern, identification with the whole of humanity, and concern for future generations were positively associated with impartial beneficence but negatively associated with instrumental harm; and although instrumental harm was associated with subclinical psychopathy, impartial beneficence was associated with higher religiosity. Importantly, although these two dimensions were independent in the lay population, they were closely associated in a sample of moral philosophers. Acknowledging this dissociation between the instrumental harm and impartial beneficence components of utilitarian thinking in ordinary people can clarify existing debates about the nature of moral psychology and its relation to moral philosophy as well as generate fruitful avenues for further research.

Is the tendency to morally prioritize humans over animals weaker in children than adults? In two pre-registered studies (N = 622), 5- to 9-year-old children and adults were presented with moral dilemmas pitting varying numbers of humans against varying numbers of either dogs or pigs and were asked who should be saved. In both studies, children had a weaker tendency to prioritize humans over animals than adults. They often chose to save multiple dogs over one human, and many valued the life of a dog as much as the life of a human. While they valued pigs less, the majority still prioritized ten pigs over one human. By contrast, almost all adults chose to save one human over even one hundred dogs or pigs. Our findings suggest that the common view that humans are far more morally important than animals appears late in development and is likely socially acquired.

Robert Nozick famously raised the possibility that there is a sense in which both deontology and utilitarianism are true: deontology applies to humans while utilitarianism applies to animals. In recent years, there has been increasing interest in such a hybrid views of ethics. Discussions of this Nozickian Hybrid View, and similar approaches to animal ethics, often assume that such an approach reflects the commonsense view, and best captures common moral intuitions. However, recent psychological work challenges this empirical assumption. We review evidence suggesting that the folk is deontological all the way down—it is just that the moral side constraints that protect animals from harm are much weaker than those that protect humans. In fact, it appears that people even attribute some deontological protections, albeit extremely weak ones, to inanimate objects. We call this view Multi-level Weighted Deontology. While such empirical findings cannot show that the Nozickian Hybrid View is false, or that it is unjustified, they do remove its core intuitive support. That support belongs to Multi-level Weighted Deontology, a view that is also in line with the view that Nozick himself seemed to favour. To complicate things, however, we also review evidence that our intuitions about the moral status of humans are, at least in significant part, shaped by factors relating to mere species membership that seem morally irrelevant. We end by considering the potential debunking upshot of such findings about the sources of common moral intuitions about the moral status of animals.

There is public support in the United States and Europe for accounting for animal welfare in national policies on food and agriculture. Although an emerging body of research has measured animals’ capacity to suffer, there has been no specific attempt to analyze how this information is interpreted by the public or how exactly it should be reflected in policy. The aim of this study was to quantify Americans’ preferences about farming methods and the suffering they impose on different species to generate a metric for weighing the trade-offs between different approaches of promoting animal welfare. A survey of 502 residents of the United States was implemented using the online platform Mechanical Turk. Using respondent data, we developed the species-adjusted measure of suffering-years, an analogue of the disability-adjusted life year, to calculate the suffering endured under different farming conditions by cattle, pigs, and chickens, the three most commonly consumed animals. Nearly one-third of respondents reported that they believed animal suffering should be taken into account to a degree equal to or above human suffering. The 2016 suffering burden in the United States according to two tested conditions was approximately 66 million SAMYs for pigs, 156 million SAMYs for cattle, and 1.3 billion SAMYs for chickens. This calculation lends early guidance for efforts to reduce animal suffering, demonstrating that to address the highest burden policymakers should focus first on improving conditions for chickens.

The 2016 outbreak of the Zika arbovirus was associated with large numbers of cases of the newly-recognised Congenital Zika Syndrome. This novel teratogenic epidemic raises significant ethical and practical issues. Many of these arise from strategies used to avoid cases of CZS, with contraception in particular being one proposed strategy that is atypical in epidemic control. Using contraception to reduce the burden of CZS has an ethical complication: interventions that impact the timing of conception alter which people will exist in the future. This so-called ‘non-identity problem’ potentially has significant social justice implications for evaluating contraception, that may affect our prioritisation of interventions to tackle Zika. This paper combines ethical analysis of the non-identity problem with empirical data from a novel survey about the general public's moral intuitions. The ethical analysis examines different perspectives on the non-identity problem, and their implications for using contraception in response to Zika. The empirical section reports the results of an online survey of 93 members of the US general public exploring their intuitions about the non-identity problem in the context of the Zika epidemic. Respondents indicated a general preference for a person-affecting intervention over an impersonal intervention. However, their responses did not appear to be strongly influenced by the non-identity problem. Despite its potential philosophical significance, we conclude from both theoretical considerations and analysis of the attitudes of the community that the non-identity problem should not affect how we prioritise contraception relative to other interventions to avoid CZS.

Across eight experiments (N = 2310), we studied whether people would prioritize rescuing individuals who may be thought to contribute more to society. We found that participants were generally dismissive of general rules that prioritize more socially beneficial individuals, such as doctors instead of unemployed people. By contrast, participants were more supportive of one-off decisions to save the life of a more socially beneficial individual, even when such cases were the same as those covered by the rule. This generality effect occurred robustly even when controlling for various factors. It occurred when the decision-maker was the same in both cases, when the pairs of people differing in the extent of their indirect social utility was varied, when the scenarios were varied, when the participant samples came from different countries, and when the general rule only covered cases that are exactly the same as the situation described in the one-off condition. The effect occurred even when the general rule was introduced via a concrete precedent case. Participants' tendency to be more supportive of the one-off proposal than the general rule was significantly reduced when they evaluated the two proposals jointly as opposed to separately. Finally, the effect also occurred in sacrificial moral dilemmas, a general phenomenon occurring in multiple moral contexts. We discuss possible explanations of the effect, including concerns about negative consequences of the rule and a deontological aversion against making difficult trade-off decisions unless they are absolutely necessary.

The non-identity problem arises when our actions in the present could change which people will exist in the future, for better or worse. Is it morally better to improve the lives of specific future people, as compared to changing which people exist for the better? Affecting the timing of fetuses being conceived is one case where present actions change the identity of future people. This is relevant to questions of public health policy, as exemplified in some responses to the Zika epidemic. There is philosophical disagreement about the relevance of non-identity: some hold that non-identity is not relevant, while others think that the only morally relevant actions are those that affect specific people. Given this disagreement, we investigated the intuitions about the moral relevance of non-identity within an educated sample of the public, because there was previously little empirical data on the public’s views on the non-identity problem. We performed an online survey with a sample of the educated general public. The survey assessed participants’ preferences between person-affecting and impersonal interventions for Zika, and their views on other non-identity thought experiments, once the non-identity problem had been explained. It aimed to directly measure the importance of non-identity in participants’ moral decision-making. We collected 763 valid responses from the survey. Half of the participants (50%) had a graduate degree, 47% had studied philosophy at a university level, and 20% had read about the non-identity problem before. Most participants favoured person-affecting interventions for Zika over impersonal ones, but the majority claimed that non-identity did not influence their decision (66% of those preferring person-affecting interventions, 95% of those preferring impersonal ones). In one non-identity thought experiment participants were divided, but in another they primarily answered that impersonally reducing the quality of life of future people would be wrong, harmful and blameworthy, even though no specific individuals would be worse off. Non-identity appeared to play a minor role in participants’ moral decision-making. Moreover, participants seem to either misunderstand the non-identity problem, or hold non-counterfactual views of harm that do not define harm as making someone worse off than they would have been otherwise.

BackgroundDecisions about withdrawal of life support for infants have given rise to legal battles between physicians and parents creating intense media attention. It is unclear how we should evaluate when life is no longer worth living for an infant. Public attitudes towards treatment withdrawal and the role of parents in situations of disagreement have not previously been assessed.MethodsAn online survey was conducted with a sample of the UK public to assess public views about the benefit of life in hypothetical cases similar to real cases heard by the UK courts (eg, Charlie Gard, Alfie Evans). We then evaluated these public views in comparison with existing ethical frameworks for decision-making.ResultsOne hundred and thirty participants completed the survey. The majority (94%) agreed that an infant’s life may have no benefit when well-being falls below a critical level. Decisions to withdraw treatment were positively associated with the importance of use of medical resources, the infant’s ability to have emotional relationships, and mental abilities. Up to 50% of participants in each case believed it was permissible to either continueorwithdraw treatment.ConclusionDespite the controversy, our findings indicate that in the most severe cases, most people agree that life is not worth living for a profoundly disabled infant. Our survey found wide acceptance of at least the permissibility of withdrawal of treatment across a range of cases, though also a reluctance to overrule parents’ decisions. These findings may be useful when constructing guidelines for clinical practice.