[W]ell, I guess I’m not done. Macdonald and Duchesne explain what happened, who did it, and how they did it, even why they did it.
But neither of them explain why we were vulnerable to it, other than we are less group-ish than other peoples with higher trust, (probably because of outbreeding.)
So our outbreeding created trust, which allowed us to be invaded by people who were not honest, did not practice trust, practiced parasitism,
In other words, is an aggressive parasitic people more successful than a high trust outbred productive people?