Many times it has been claimed on these boards that moral relativism was wrong. A most recent comment labeled such an opinion as "stupid". As I understand it, moral relativism is about the notion that all morality is ultimately arbitrary. Or in other words - relative to the perceiver of things. Meaning, there is no rational morality can rest on in its origin - the origin is arbitrary. Just the way on from this origin can be fostered using rationals / objective truths. I personally do believe that a single assumption suffices to rationalize a whole universe of morality. Yet, there is still this single assumption. So would some opposer of moral relativism please step up and explain what is wrong with moral relativism? Because I don't get it.