The Middle East with its reliance on scant water supplies has an all or nothing attitude in some ways. He who controlled the oasis lived. I haven’t dine enough work on this to do more than merely point out a few obvious things. I think tribal conflicts, which seemingly have been a part of all tribal societies were nature’s way of blending gene pools. So people in general were strengthened. Which if true presupposes some sort of organizing intelligence. But also it speaks of inclination to rape and steal.