I guess who cares about civility if you're the last man standing.

Also - that word: civility. We're animals driven by self-interest. What should civility even mean here

> We're animals driven by self-interest. What should civility even mean here

That self-interest has led to cooperation between humans. Humans have evolved to work together, cooperate, form social bonds, and friendships because doing so improves survival and wellbeing over the long run. Civility is part of that toolkit. It is not a denial of self-interest. Civility is part of that self-interest.