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Sometimes it’s not certain which of several mutually exclusive moral views is correct. Like almost everyone, I think that there’s some sense in which what one should do depends on which of these theories is correct, plus the way the world is non-morally. But I also think there’s an important sense in which what one should do depends upon the probabilities of each of these views being correct. Call this second claim “moral uncertaintism”. In this paper, I want to address an argument against moral uncertaintism offered in the pages of this journal by Brian Weatherson, and seconded elsewhere by Brian Hedden, the crucial premises of which are: that acting on moral uncertaintist norms necessarily involves motivation by reasons or rightness as such, and that such motivation is bad. I will argue that and are false, and that at any rate, the quality of an agent’s motivation is not pertinent to the truth or falsity of moral uncertaintism in the way that Weatherson’s and Hedden’s arguments require.

Normative judgments involve two gradable features. First, the judgments themselves can come in degrees; second, the strength of reasons represented in the judgments can come in degrees. Michael Smith has argued that non-cognitivism cannot accommodate both of these gradable dimensions. The degrees of a non-cognitive state can stand in for degrees of judgment, or degrees of reason strength represented in judgment, but not both. I argue that (a) there are brands of noncognitivism that can surmount Smith’s challenge, and (b) any brand of non-cognitivism that has even a chance of solving the Frege–Geach Problem and some related problems involving probabilistic consistency can also thereby solve Smith’s problem. Because only versions of non-cognitivism that can solve the Frege–Geach Problem are otherwise plausible, all otherwise plausible versions of noncognitivism can meet Smith’s challenge

Some philosophers argue that nothing can be morally right or wrong because there are no moral values in the world, just as there are no ghosts or goblins. Others argue that nothing can be right or wrong because the moral "ought" can't be defined in non-moral terms, or otherwise lacks "content" or "sense". Some philosophers reply to these charges via moral metaphysics -- trying to show that there are moral values in the world after all -- or via moral semantics -- trying to show how the moral "ought" can be defined in non-moral terms or otherwise have sense or content. ​ I reject all of this. I contend that there are objective moral truths that are utterly immune to being undermined, or for that matter, vindicated, by arguments in metaphysics, semantics, epistemology, and so forth. Ethics is an entirely autonomous domain of inquiry, which neither requires nor admits of a "foundation". The purpose of this book is to explain why this jarring view of ethics is true.

Nobody's going to object to the advice "Do the right thing", but that doesn't mean everyone's always going to follow it. Sometimes this is because of our volitional limitations; we cannot always bring ourselves to make the sacrifices that right action requires. But sometimes this is because of our cognitive limitations; we cannot always be sure of what is right. Sometimes we can't be sure of what's right because we don't know the non-normative facts. But sometimes, even if we were to know all of the non-normative facts, we'd still not be sure about what's right, because we're uncertain about the normative reasons those facts give us. In this dissertation, I attempt to answer the question of what we're to do when we must act under fundamentally normative uncertainty. It's tempting to think that, in such circumstances, we should do what we regard as most probably right. I argue that this view is mistaken, for it is insensitive to how degrees of actions' values compare across different normative hypotheses; if an action is probably right, but, if wrong, is terribly, terribly, wrong, it may be rational not to do that action. A better answer is that we should do the action with the highest expected value. I spend the first part of the dissertation providing arguments for and rebutting arguments against this view of action under normative uncertainty. I spend the next part of the dissertation explaining what degrees of value are, and showing how they can be compared across normative hypotheses. In the remaining parts of the dissertation, I consider two questions related to our primary question -- first, what is one required, or obligated, to do under normative uncertainty; and second, what is it rational for one to do when one is not only normatively uncertain in the way we've been discussing, but also uncertain about what it is rational to do under this sort of normative uncertainty.

Anatole France’s The Red Lily is best known for this ironic aphorism: ‘The law, in its majestic equality, forbids the rich as well as the poor to sleep under bridges, to beg in the streets, and to steal bread.’ The laws mentioned in this aphorism are open to two criticisms. The first criticism is that they forbid conduct that oughtn’t to be forbidden. The second criticism is that they unfairly place greater burdens of compliance on some than on others. It may be onerous for the poor to comply with the law against, say, sleeping under bridges; not so for the rich. It is this second criticism that I read France as expressing, and it is the reach of this criticism that I explore in this essay. Specifically, I want to ask whether the second criticism may apply to a law even if the first criticism does not – whether there can be laws that are good in the sense that they forbid behavior that genuinely ought to be forbidden, but that are nonetheless unfair in the distribution of compliance burdens they yield. Some examples may tempt us to say ‘no.’ It may be more burdensome for thrill-seekers than for the rest of us to comply with laws against speeding, but that does not make speeding laws unfair. But I argue that the answer is ‘yes.’ Good laws can, and surprisingly often do, yield unfair distributions of compliance burdens. I conclude the essay by showing how remedies for this sort of unfairness might work.

This chapter explores the possibility of a metaphysically deflationist, explanatorily robust version of moral realism. The view has no truck with inquiries into the naturalness, constitution, or reducibility of moral properties, and purports to dissolve, rather than solve, the “placement problem.” But it offers a general explanation from outside the ethical domain of how we can accurately represent the world in moral thought and talk; this distinguishes it from some versions of expressivism and constitutivism, and from quietism. It is often claimed that defenders of non-quietist moral realism “owe us” an account of what moral properties are like, how they fit into the world described by science, how we can “reach out to them” in thought and language, and how they can exert an influence on us so we can know of them. It is not clear, this chapter argues, that the robust realist is under any such obligation.