  As a general objection to moral relativism, the objection is unsuccessful, since it is possible to formulate moral relativism without the assumption that moral judgments express true or false claims. Thus, Charles Stevenson, who takes them to be expressions of attitude, holds that people can disagree in attitude even if their moral views have no truth-value and cannot be logically inconsistent in the sense that Moore intended (Stevenson 1944 and 1963). The objection is successful, however, against the attempt to save the possibility of moral knowledge by interpreting the moral claims as being true or false claims about different cultures or points of view. If each disputant, in taking issue with the other, is disagreeing about what is true, then the disputants cannot be making claims about different things and hence cannot have knowledge of the kind the moral relativist supposes. If they did, neither could be disagreeing about the truth of the other’s moral claim. In the next section we will return to the position that moral claims are merely expressions of attitude, a position consistent with the fact of moral disagreement. For now we should concede that moral relativism does not offer a satisfactory explanation of how moral knowledge is possible in cases of radical moral disagreement between people of different cultures of subcultures.