>>519289166
Their environment doesn't necessitate higher psychological development to survive. So those with lower levels of psychological development, fuck and fight a whole bunch, and the few with higher levels of psychological development, are either bred out, killed, or exiled, because their higher level of psychological development, is not understood nor valued. What you get is the monkey with the largest club, being the one that gets all the females. Caveman shit.
Whereas in cold climates, the guy who can build the better tools and shelter, has a better chance of surviving. So those capable of innovation, are socially valued, making him attractive to females and therefore more likely to reproduce.

TLDR: Reproduction based on biggest stick vs reproduction based on innovation and intelligence.

>>518712910
Based.