I remember when I was a kid, Teachers never cared to stop fights in school. Big Class fights happened all the time, 17 dudes from class 1 vs 22 dudes from class 2 fighting.  I was a regular participant. Hell, Fighting is fun haha. Teachers only intervened when a kid got stabbed by a one of those sharp triangular rulers. This was in a private school for children of upper middle class too. I Hear this is pretty common amongst most of the  kids I've met. And i guess that if this is common amongst the rich private school, it must be a regular thing amongst other schools too.