From what has been gathered by archeologists so far, it seems that we were Cave Humans for tens of thousands of years. It stands to reason that natural selection worked on us and gave us characteristics useful to the life of Hunter/Gatherers. Now that we’ve conquered such lofty skills as being able to handle fire, we’ve got to turn our adapted selves around and attempt to become Modern Humans or even Civilized Humans. I think we’re having troubles getting away from the instincts that have been bred into us.
I’m going to start out by taking exception to the terminology I used above. The expression Hunter/Gatherers focuses on the way we acquired our food, a serious consideration in those bad old days. However, I want to take a slightly more sociological look at that society and change the expression to Warrior/Nurturers, because that was what was happening. Guys were grabbing up their weapons and going out and hunting down the meat for the table and also fighting off the Guys from other tribes who were also wandering around out there with their weapons. In some societies these two functions merged into the same thing. The Gals were staying in the communal area, taking care of the young and filling the tribal larders with nuts and berries.
Then humanity learned how to smelt metals, plant crops, and etch printed circuit boards, all in one week, I think. This left us Nurturers/Hunters/Warriors/Gatherers scratching our heads trying to figure out what to do. We had a whole new environment to react to, and only bad old instincts to guide us.
So we’ve got a whole bunch of social ills running through our societies, most of them born in caves: gender equality, racial prejudice (them damned illegal aliens that kept poaching the mastodons out of our territory), and aggression against other humans. Maybe if we look at them in the light of their origins, we might be able to fix them.