Forgot the name and creator of the theory but it’s basically in/out-group theory. Originally thought up to explain youth criminality in particular.
On another note, if you are interested run a check-list on the criteria that lead to mass criminality as in genocide and the like for Russia/China and the USA in particular. It’s appalling how close they are in that regard. If we ever get a 3rd world war the war crimes will be uncountable
On another note, an American friend that lives in Germany now told me that the German subs taste wayyyy better as in incomparably better