Yeah. Kids are just so mean. Sometimes, when a child gets bullied and they can't fight back, they'll become very on-edge and likely to lash out in self-defense with very little provocation. It's pretty much a case of PTSD, because if you live in an environment where you don't feel safe, for a long time, then you just get used to always being alert, always being ready to defend yourself; and when anybody attacks or seems to attack, you lash out just for survival.