Pre-industrial society was a horrifying murder fest that gets worse the further you go back with people living in prehistoric societies 9 times more likely to die of violence. One needed to begin taking on responsibility very early both because early societies needed every hand available just to secure enough food but because you might not have long.

The operation of such societies should be regarded as an optimization for current circumstances rather than an optimal strategy. If you think what we are doing is poorly suited you are going to have to justify that position on its own merits.