Earlier quoted context omitted.
Their life is shit already, that's why they act as they act, passing aggression on to others in vain effort to get rid of some of that 'evil' in them. I understand this knee-jerk reaction very well, but it just feeds the neverending spiral of aggression. We humans act like storage of both good and bad, it then comes back up in various situations. What I want to say - you just beating up a bully will mean some other k…
IIRC this is a misconception and bullies bully strategically to climb the social ladder and benefit from it. It's possible that they do it because they learned pathological systems of behaviour from pathological family/social experiences, but even if fighting back against them is also shitty, it beats enabling them to keep doing it (especially to you)
pretty much any human social phenomenon can have multiple causes.