in general, when you try and force lots of different people into a tightly enclosed space making it illegal to leave they act like cunts to each other.
Yep very true.
how did i know it was going to be black people just from the title
I went to overcrowded school in a poor area with all whites and there were fights all the time. There were no mass brawls though in general, the fighting was just as nasty though (several people beating up some poor fuck happened occasionally).
Its a socio economic issue first and foremost. If some people want to fight and it is a fair fight in a "controlled" environment it can prove to be healthy. Street fights are fucking dangerous especially as you get older, avoid every time if possible.