Throughout history the most destructive, combative people joined armies for the possibility of rape and pillage if victorpus. Huge numbers of these most hostile folks of society got killed off in battle.

Today, modern armies aren't interested in crude hostile types. They need a smarter cut of soldier in our higher tech wars. Thus society is filling up with violent misfits who seek out destructive misfit leaders like Donald Trump. Demacracy and the rule of law is the last thing these thuggish types care about.