Comment by TeeMassive

I'm surprised that there are no mentions of uncontacted tribes (ctrl-f of 'uncon' and 'native' yields no matches). It seems that violence and extreme xenophobia is the cultural norm, not the exception from a few psychopaths. And the methodology seems dubious, trying to estimate social behavior, norms and statistics based of people long gone and whose remains are scattered far and wide both in place and time.