Expressivism Distinguished From Descriptivist Subjectivism
Expressivism does not hold that the function of moral sentences as used in ordinary discourse is to describe the speaker’s moral attitudes. Expressivists are united in rejecting ethical subjectivism: the descriptivist view that utterances of the type “X is good/bad” mean “I approve/disapprove of X”. Subjectivism is a descriptivist theory, not an expressivist one, because it maintains that moral sentences are used to represent facts–namely, facts about the subject’s psychological states.
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