The bloodlust is easy to explain. The tribe better at war survives. Veneration of honorable warriors runs deep in our veins. Sales for Top Gun, Marvel movies, action games continue to soar.

The puritanical outlook developed to create stable monogamous families. That bit of artifice is dissolving now. More polygamy means the top men hoarding reproductive access, which historically leads to instability. Sexual socialism was an interesting run, but with the demise of religion, I'm not sure how we could save it.