All cultures are about the same. We kill males and save women and children because decisions are made by males and males see other males as competitors. The chinese do it. The jews do it. The muslims do it. The europeans do it.
If you have one simple theory that can correctly predict humans behavior at such a huge range, that’s one damn good theory. Those theory is evolution theory and economy. Put “maximize reproductive success” in economic’s utility function, tada, you got humans behavior.