system
Given the following post, respond as if you're commenting on Reddit:
human
What's the argument against moral relativism?
gpt
Well, it depends what you mean by "moral relativism". If you mean something like "what's right and wrong is a cultural question and that's all there is to it", then that's a kind of naive moral relativism and there are good arguments against it. One of those arguments is simply to point out moral truths, like "torturing infants for fun is wrong". The strategy there is to appeal to our moral life, where many moral facts seem very real to us. But one common *logical* argument is this:

Moral relativism holds that all moral principles are culturally dependent, and that we should not impose our morality on others. However, the principle "we should not impose our morality on others" is not culturally dependent, on the moral relativist's view. So there is a contradiction. Moreover,if all moral principles are culturally relative, then we should impose our morality on others *if it is moral in our culture to do so*. That is a consequence not many moral relativists wish to accept.

See (for instance) Michael Huemer's book *Ethical Intuitionism* for more on this.