The study of prehistory is fascinating. There is still difference of opinion on some aspects and conclusions drawn. I wonder about the influence of population size and density. The massacre at Nataruk is an example of warfare in hunter gatherer societies. Refs: Scientific American and Smithsonian. The articles suggest that human aggression with regard to resources may not have been strictly limited to farming communities since hunter gatherers also had an interest in resources and may have valued an area of plentiful resources and stayed put until they depleted local resources before moving on.
World population has essentially quadrupled since my childhood and is orders of magnitude larger than in prehistoric times. I wonder if population growth and the associated competition for resources is a key cause of societal change from a more peaceful egalitarian society to a militaristic hierarchical one. If it is, will it take an apocalypse to yield conditions where a more egalitarian peaceful society can exist as suggested in the Biblical Isaiah 2:4 “And He shall judge among the nations, and shall rebuke many people; and they shall beat their swords into plowshares, and their spears into pruning hooks; nation shall not lift up sword against nation, neither shall they learn war anymore.” The mysterious builder of the Georgia Guidestones seems to have been thinking along those lines with guidelines for a greatly reduced population.