He's again talking about relatively recent human history, which says nothing whatsoever about how egalitarian nomadic hunter-gatherer tribes lived for 97% of history when the population density was tiny, resources were abundant, and a lot of ones relatives lived in neighboring tribes. The Mesolithic era only began about 9k years ago. It's about as relevant to any ideas of "human nature" as Pinker's crock of a book.

https://medium.com/inside-of-elle-beau/the-inner-demons-of-pinkers-better-angels-c56f77d1ed94

Aside from the fact that 2 violent deaths in one small Danish settlement after the Paleolithic age cannot be generalized to much, mobile hunter-gatherers have different social organizations and different cultural norms than ones who live in settlements, and for 97% of human history, our ancestors lived in these types of nomadic bands where there was low population density, ample natural resources, lots of kin in neighboring tribes, and group mores designed to enforce harmony and peace.