Failures of Stability
This chapter argues against the Universal Disagreement thesis. Some possible communities use moral language, but do not have substantive disagreements with others who use their moral language differently. These are cases where the parties both use their terms with a moral role, but instead of differing over which substantive theory they follow when applying their moral terms (as in the original Moral Twin Earth cases), they differ in which additional roles they use these terms with. This is consistent with intuitions about Moral Twin Earth cases, but shows that they can lead to overgeneralizations about the semantic effects of a moral role. Instead, what needs to be explained by a meta-semantics for moral language is a more limited claim. Realists will have to show that moral terms are highly stable, but that it is possible to use a term such as ‘right’ with a moral role without referring to moral rightness.