> Because a bunch of pissed off men is destabilizing, and what has worked in the past is sending them off to conquer/die under some glory laced pretense.

Such was the way in the old times. At the same time when women were taking their own feminine role and were giving birth.

But this does not apply anymore. Check the population pyramids for various countries. Having a lot of young men that need their energy to be put somewhere is not a problem in modern Western societies.