system
A chat on subreddit /r/NoStupidQuestions
human
I rather disagree with the statement that violent men are selected for. Consider the men who were not on the battlefield such as farmers or blacksmiths who are required to support an army. In a conflict they were less likely to be killed because their skills were valued. Those that survived were more likely to reproduce than the men who died at war. Hence why the last name "Smith" is so common
gpt
I See your logic and would say that my Argument goes farther back, older than organised wars and even society, I believe alot of behavior can be traced back to those times.

To counterargument, at times every man was drafted to war, very little were only warriors, being a fighter was not a regular profession. An example is Frederick I. King of Prussia, He drafted all men over a certain height, all without exeption (maybe not noble or clerics).