 Uncovering a syntax, however, is a descriptive and not a justificatory task. Once we can identify the grammar or rules that best account for a person's syntactic competency, we do not ask the question, Should that person have this grammar? We are satisfied to have captured the grammar underlying a person's idiolect. In ethics and political philosophy, in contrast, we must answer that justificatory question, especially since there is often disagreement among people about what is right, disagreement that is not resolved simply by pursuing narrow reflective equilibrium.