Questions on Ethical Values and Relativism

1. How is moral philosophy (ethics) concerned less with describing various individual or social practices and more with the justification of the beliefs underlying those practices?
2. How is the principle of tolerance inconsistent with both ethical subjectivism and cultural relativism?
3. How do both ethical subjectivism and cultural relativism commit the naturalistic fallacy?
4. What is wrong with thinking that moral beliefs are expressions of personal preferences (like matters of taste)?
5. According to cultural relativists (e.g., Benedict), why can't the moral values of a culture themselves be evaluated using a universal (e.g., "rational") criterion?