Some people claim their ethics transcend nature, which is an entirely different. Nobody can explain why their version of the good is right with reference to objective criteria, thereby allowing everyone to come to the same conclusion. Ethics, when not studied from an anthropological perspective, is just religion.

Here in reality, you might not feel that might makes right, and I may or may not agree with you, but that's moot when some other ethical outlook out-competes yours via violence, oppression, demographics, or social trends and a thousand years from now someone is reading about your ethical system and laughing at its quaintness, or perhaps shivering a bit with horror.

Personally, I regard 'universal humanitarianism' as something of a suicide pact.