This paper offers a noncognitivist characterization of moral attitudes, according to which moral attitudes count as such because of their inclusion of moral concepts. Moral concepts are distinguished by their contribution to the functional roles of some of the attitudes in which they can occur. They have no particular functional role in other attitudes, and should instead be viewed as evolutionary spandrels. In order to make the counter-intuitive implications of the view more palatable, the paper ends with an account of the evolution of normative judgments as exaptations of the cognitive structures that underlie beliefs.

Expressivists have trouble accounting for disagreement. If ethical or other normative judgments are desire-like rather than belief-like, it is puzzling why we think people often disagree in those domains. While previous expressivists have proposed only straightforwardly descriptive conditions under which disagreement occurs, we argue that disagreement itself should be understood normatively: two or more people disagree just in case their diverging attitudes imply, given a common project of theirs, that at least one of them has reason to change his or her mind.