Terence Horgan and Mark Timmons's ' moral twin earth argument' raises doubts about the naturalistic realist's ability to make sense of genuine disagreement. I offer three arguments the realist's behalf. First, I argue that the example at the heart of their argument is underdescribed; when fully developed, it loses its intuitive force. Second, I suggest that taking the stipulations of the Horgan-Timmons example seriously gives us reason to revise our initial judgments. Third, I propose combining naturalistic realism about moral judgments (...) with expressivism about the last ought before action in order to preserve the conflict between moralists and twin -moralists. (shrink)

This paper argues that expressivism faces serious difficulties giving an adequate account of univocal moral disagreements. Expressivist accounts of moral discourse understand moral judgments in terms of various noncognitive mental states, and they interpret moral disagreements as clashes between competing attitudes. I argue that, for various reasons, expressivists must specify just what mental states are involved in moral judgment. If they do not, we lack a way of distinguishing moral judgments from other sorts of assessment and thus for identifying narrowly (...) moral disagreements. If they do, we can construct cases of intuitively real dispute that do not rest on the theory’s preferred mental states. This strategy is possible because our intuitions about moral concept-ascription do not track speakers’ noncognitive states. I discuss various ways of developing this basic argument, then apply it to the work of the two most sophisticated proponents of expressivism, Allan Gibbard and Simon Blackburn. I argue that neither is successful in meeting the challenge. (shrink)

Moral discourse allows for speakers to disagree in many ways: about right and wrong acts, about moral theory, about the rational and conative significance of moral failings. Yet speakers’ eccentricities do not prevent them from engaging in moral conversation or from having (genuine, not equivocal) moral disagreement. Thus differences between speakers are compatible with possession of moral concepts. This paper examines various kinds of moral disagreements and argues that they provide evidence against conceptual-role and informational atomist approaches to understanding our (...) moral concepts. Conceptual role approaches fail because they cannot account for shared concepts among speakers with different commitments to the practical and conative ramifications of moral judgments. Informational atomist views fail because speakers need not be locked on to the same moral properties to share moral concepts. (shrink)