> Their life is shit already, that's why they act as they act (...) you just beating up a bully will mean some other kid(s) will get beaten up (or beaten up even more) further down the line

human social life is complex and such overgeneralization are almost never right

in some cases self-defense entirely fixes the problem

> We humans act like storage of both good and bad, it then comes back up in various situations.

that is an utter nonsense, in some cases endless hugging and patting just leaves you exploited

> passing aggression on to others in vain effort to get rid of some of that 'evil' in them

well, sadly sometimes violence is right or least bad solution