> We are strongly, strongly evolutionary oriented away from 'murder' - it's the original sin. It's not something we even argue over. Murder = Bad. No disagreement across cultures. Murder = social cheating. No disagreement there either.

There are plenty of people who advocate for war and consider it good, and plenty of disagreements over war.

People are usually in agreement that war / killing is bad when other people do it but will find all sorts of ways to justify themselves doing it when it is to their advantage. This isn't really contradictory, from an evolutionary perspective.