Kids are just allowed to get away with it. If adults were allowed to beat others with no consequences - it would be happening everywhere.

Sadly - teachers encourage the "macho" "don't tatter, be a man" attitude to have less work. Hence bullying. Imagine if judges did that :) "So he stole your book, so what, be a man, deal with it yourself". "I don't care who beat whom - just shake hands and leave me be"