Luke Taylor

Expressivism is supposed to have an advantage over moral realism, in that it can explain why it is a conceptual truth that the moral supervenes on the natural, even though the natural does not entail the moral. I develop an analogy between expressivism and a version of theistic moral realism, and argue that this version of theistic moral realism shares any advantage that expressivism might have. It may be that the alleged advantage that expressivism has over moral realism is overstated. Nevertheless, possible analogies between expressivism and theistic moral realism have received very little attention in the past, and are worth considering for their own sake.

Mackie famously argued for a moral error theory on the basis that objective moral values, if they existed, would be very queer entities. Unfortunately, his argument is very brief and it is not totally obvious from what he says exactly where the queerness of moral values is supposed to lie. In this paper I will firstly show why a typical interpretation of Mackie is problematic and secondly offer a new interpretation. I will argue that, whether or not we have reason to live in the morally correct way, what seems queer about moral properties is that there is a morally correct way in which to live in the first place. This interpretation makes sense of Mackie’s claim that theism might be able to solve the queerness problem; the notion of an objectively correct way to live may make sense if theism is true, but not otherwise.

Richard Boyd and Robert Adams have both developed semantic accounts of moral terms based on Hilary Putnam's causal regulation theory for natural kind terms, according to which the terms in question refer to the properties which predominantly causally regulated the terms. However, Terence Horgan and Mark Timmons have mounted an objection to Boyd's semantics—their Moral Twin Earth argument. If this argument is successful against Boyd then it might be thought that it should also be successful against Adams, given the similarity between their semantic accounts. I will argue in this essay that Adams's semantics is sufficiently different from Boyd's to enable him to survive Moral Twin Earth, but that he is vulnerable to a modified version of Moral Twin Earth that I describe.