  The style of argument here is that of inference to the best explanation (Harman 1965). Even if the sociological premise is granted, the conclusion is not guaranteed to be true. Rather we have reason to believe the conclusion, assuming the premise is true, provided that no other explanation better accounts for the truth of the premise. This style of argument can be successful when no other explanation can account for the truth of the premise. It may seem, however, that there are plausible alternative explanations that are compatible with the possibility of moral knowledge. Two main kinds of explanation are particularly salient.