Michael Tooley

My topic is the skeptical challenges that are posed by Hume and Berkeley. Can one show, contrary to what Hume claimed, that one is justified in projecting regularities that have held in the past into the future? Can one show that induction is justified? Or can one show, contrary to what Berkeley claimed, not only that the hypothesis that there is an external, physical world expresses a coherent proposition, but also one that is extremely likely to be true? The basic theses concerning skepticism that I believe can be proved are as follows: (1) Skepticism about induction can be refuted. (2) Skepticism about the existence of an external, physical world can be refuted. Will I actually prove that these things are so? Well, as you might have guessed, not quite! Still, my goals are not completely devoid of ambition. First of all, I shall be alluding to mathematical proofs that make it very plausible that whether induction can be justified depends upon a certain metaphysical issue. You may now be thinking, “Wow, that sounds like bad news! A philosophical result in epistemology that depends upon metaphysics. I was hoping that this would be an upbeat talk.” But the answer is that the dependence upon an issue in metaphysics is not as troubling as one might initially suppose. The reason is that the metaphysical issue in question is whether something is logically possible, and so whether it is so or not is a necessary truth. In any case, I shall begin by explaining what the metaphysical issue in question is.

The ability to quickly and accurately recognise emotional states is adaptive for numerous social functions. Although body movements are a potentially crucial cue for inferring emotions, few studies have studied the perception of body movements made in naturalistic emotional states. The current research focuses on the use of body movement information in the perception of fear expressed by targets in a virtual heights paradigm. Across three studies, participants made judgments about the emotional states of others based on motion-capture body movement recordings of those individuals actively engaged in walking a virtual plank at ground-level or 80 stories above a city street. Results indicated that participants were reliably able to differentiate between height and non-height conditions (Studies 1 & 2), were more likely to spontaneously describe target behaviour in the height condition as fearful (Study 2) and their fear estimates were highly calibrated with the fear ratings from the targets (Studies 1-3). Findings show that VR height scenarios can induce fearful behaviour and that people can perceive fear in minimal representations of body movement.

This book has two main concerns. The first is to isolate the fundamental issues that must be resolved if one is to be able to formulate a defensible position on the question of the moral status of abortion. The second is to determine the most plausible answer to that question. With respect to the first question, the author argues that the following issue–most of which are ignored in public debate on the question of abortion–need to be considered. First, can the abortion question be decided without resolving the issue of the moral status of the fetus? Second, is the fact that the fetus belongs to the biologically defined species Homo Sapiens morally significant in itself? Third, what non-potential properties and necessary and/or sufficient to endow something with a right to life? Fourth, do the corresponding potentialities also make it wrong to destroy something? Fifth, does any property that suffices to give something a right to life admit of degrees, and if so, is it morally significant regardless of the extent to which it is present? Sixth, is it morally permissible to refrain from producing additional people who would lead satisfactory lives? And finally, at what point do developing human beings acquire those properties that give something a right to life – at conception, or at some later point? Alternative answers to these central questions are set out and discussed in a detailed way. Some of the issues are difficult, but it is argued that plausible answers can be advanced, and that they support a liberal position on the morality of abortion.

This essay deals with the morality of abortion. We argue that abortion is morally unobjectionable and that society benefits if abortion is available on demand. We begin by setting out a preliminary case in support of the practice of abortion. We then examine moral objections to abortion and show why those objections are unsound. We conclude by considering what properties something needs in order to have a serious right to life, and we show that a human fetus does not possess those properties. Thus, since there is no moral objection to abortion, the practice must be viewed as both permissible and desirable, in the light of the advantages outlined in the first section of our paper.

This chapter is concerned with evidentialism, and with the bearing of evidentialism on the question of whether theistic belief is epistemically justified. The first task is to determine how evidentialism is best formulated, and answering that question requires considering both the concept of evidence, and the idea of epistemically basic, or non‐inferentially justified beliefs. Given a promising account of evidentialism, I then consider two important objections, one of which claims that beliefs always rest upon presuppositions that cannot themselves be justified, and the other of which claims that evidentialism entails skepticism, and must therefore be rejected. After answering those objections, I conclude by briefly considering the implications of evidentialism for religious belief in general, and for theism in particular.

In this essay I defend the following two claims: first, given appropriate circumstances, neither voluntary active euthanasia, nor assisting someone to commit suicide, is in any way morally wrong; secondly, there should be no laws prohibiting such actions, in the relevant cases. The discussion is organized as follows. In the first section, I set out some preliminary concepts and distinctions. Then, in sections two and three, I offer two arguments in support of the thesis that assisted suicide and voluntary active euthanasia are not morally wrong. Finally, in section four, I ask whether there is any reason for thinking that, even if, as I have argued, voluntary active euthanasia and assisted suicide are not morally wrong, they should, nevertheless, not be legally permitted, and I argue that this is not the case.

This essay is concerned with two questions. First, is the cloning of humans beings morally acceptable, or not? Secondly, if it is acceptable, are there any significant benefits that might result from it? I begin by drawing a distinction between two very different cases in which a human organism is cloned: the first aims at producing a mindless human organism that will serve as a living organ bank; the second, at producing a person. I then consider each of these in turn. The moral issues raised by the former are the same as those raised by abortion. For this reason, I do not discuss such cloning at length - though I do indicate, very briefly, the reasons for thinking that it is not morally problematic. The rest of the essay then focuses upon the question of the moral status of cloning in cases where the goal is to produce a human person. Here I begin by distinguishing between the question of whether such cloning is in principle morally acceptable, and the question of whether its use at the present time is morally defensible. The second of these questions I consider only briefly, but I do argue that the attempt to produce persons via cloning at the present time is open to serious moral objections. I then turn to the first question, and there I argue, first, that cloning that has the goal of producing persons is not intrinsically wrong; secondly, that such cloning would have a number of potential benefits; and thirdly, that none of the objections that have been directed against this sort of cloning can be sustained. My overall conclusion, accordingly, is that both sorts of cloning are in principle morally acceptable, and potentially beneficial to society.

In her book, The Dilemma of Freedom and Foreknowledge, Linda Zagzebski suggests that among the strongest ways of supporting the thesis that libertarian free will is incompatible with divine foreknowledge is what she refers to as the Accidental Necessity argument. Zagzebski contends, however, that at least three satisfactory responses to that argument are available.I argue that two of the proposed solutions are open to strong objections, and that the third, although it may very well handle the specific versions of the Accidental Necessity argument that Zagzebski considers, fails when confronted with a stronger version of the Accidental Necessity line of argument.

1.1 The Concept of Evil The problem of evil, in the sense relevant here, concerns the question of the reasonableness of believing in the existence of a deity with certain characteristics. In most discussions, the deity is God, understood as an omnipotent, omniscient, and morally perfect person. But the problem of evil also arises, as Hume saw very clearly, for deities that are less than all-powerful, less than all-knowing, and less than morally perfect. What is the relevant concept of evil, in this context? Here it is useful to distinguish between axiological concepts and deontological ones. First, there are judgments about whether certain states of affairs make the world better or worse, whether those states are good or bad, desirable or undesirable. Such normative concepts – of good and bad, or desirable and undesirable, states of affairs – are axiological concepts. Secondly, there are judgments about the rightness and wrongness of actions, about what one morally ought or ought not do, of what one’s duty is, of whether a certain action violates someone rights, and these concepts – of the rightness and wrongness of actions, of duties, of the rights of individuals, of what one should or should not do – are deontological concepts. Given this distinction, should the problem of evil be understood axiologically or deontologically? Often, and I think most commonly in this context, evils are equated with states of affairs that, all things considered, are bad or undesirable: they are states of affairs that make the world a worse place. But one can also interpret the problem of evil in a deontological fashion, equating evils with states of affairs that a person should have prevented, if he could have done so. Elsewhere (2008, 105-6), I have argued that the deontological interpretation is preferable. But for present purposes, either interpretation will be fine. 1.2 Evil and the Reasonableness of Belief in the Existence of God That many things in the world – tsunamis, earthquakes, the suffering of non-human animals and innocent children, human actions such as the carrying out of the Holocaust – certainly appear to be evil is not a controversial matter. But whether such things are really evils, all things considered, is disputed. Assume, however, that the world does continue genuine evils, and not merely apparent ones. How, then does the existence of such evils bear upon the reasonableness of belief in the existence of God? First, the existence of evils can be used to show that certain arguments for the existence of God cannot establish that conclusion, or even render it probable. For some arguments, of course, one need not appeal to evil to make that point. If someone argues for the existence of a first cause, or an unmoved mover, or a necessary being having its necessity of itself, and then claims that this is what everyone understands by the term “God”, one can point out that no reason has been offered for thinking that the entity in question is even a person, let alone omnipotent, omniscient, and perfectly good. By contrast, with the type of argument that Hume was concerned with when he discussed the problem of evil – namely, arguments from the existence of order in the world to the existence of a designer, or intelligent cause of that order – one does have a type of argument that, if sound, shows that there is a person who, even if not omnipotent and omniscient, is at least extremely powerful and very knowledgeable. But such arguments do not support for conclusions about the moral character of such a person, and so it is at this point that the existence of evils becomes crucial. For in providing a reason for holding that the one is not justified in attributing even moral goodness to such a being, let alone moral perfection, it supports the conclusion that that argument in question cannot be a successful argument for the existence of God. The existence of evils, then, can serve to block arguments for the existence of God. But a second, and very familiar possibility, is that the existence of evils can also provide the basis of arguments against the existence of God. A very important distinction here is between deductive, or logical incompatibility, versions of the argument from evil, and inductive, or evidential, or probabilistic versions of the argument. According to the former, there are facts about the existence of evils in the world that are logically incompatible with the existence of God. Thus, some have held that the mere existence of any evil whatsoever is incompatible with the existence of God; others, that that certain types of evil – such as natural evils – are incompatible with the existence of God; and others, that it is the amount of evil in the world, or the fact that some people suffer horrendous evils, that logically precludes the existence of God. Inductive (or evidential, or probabilistic) versions of the argument from evil, by contrast, do not claim that there are facts about the evils in the world that are logically incompatible with the existence of God. The claim is rather that there are facts about the evils found in the world that render the existence of God at the very least unlikely, and perhaps extremely so. 1.3 Hume’s Use of the Existence of Evils The preceding discussion suggests two very different ways in which Hume might be employing the existence of evils. First, he might be appealing to the existence of evils simply to undercut certain arguments for the existence of God. In particular, he might be appealing to evils to show that, whatever the merits of the argument from order to design may be, it can nether establish, nor render probable, the existence of a morally good deity. Secondly, Hume might be advancing a version of the argument from evil, and that in turn could take the form either of an argument that claims that facts about evil are logically incompatible with the existence of God, or of an argument that claims, more modestly, that the apparent evils found in the world render the existence of God unlikely.

Different approaches to causation often diverge very significantly on ontological issues, in the case of both causal laws, and causal relations between states of affairs. This article sets out the main alternatives with regard to each. Causal concepts have surely been present from the time that language began, since the vast majority of action verbs involve the idea of causally affecting something. Thus, in the case of transitive verbs describing physical actions, there is the idea of causally affecting something external to one — one finds food, builds a shelter, sows seed, catches fish, and so on — while in the case of intransitive verbs describing physical actions, it is very plausible that they involve the idea of causally affecting one's own body — as one walks, runs, jumps, hunts, and so on.