  It has seemed obvious to many that non-cognitivism has much in common with various relativist metaethical views. Though non-cognitivists may deny that the truth values of moral judgments are relative to speakers or agents because such judgments have no truth values, non-cognitivists have often accepted something similar to relativism. For non-cognitivists hold that it is semantically appropriate for a person to utter a moral judgment whenever she wishes to express the relevant non-cognitive attitude. And many noncognitivists also believe that there are few rational constraints on holding the relevant attitudes.  But then it is hard to see how consistent moral judgments can be mistaken (Carnap 1937, 30; Hare 1963, 110). If relativism is problematic, it isn’t obvious that non-cognitivism avoids the problems.