If Barack Obama had a daughter she would look like.... oh...
The best solution is to have different leagues for the different cultures. Not separated by race, but by culture.
The more violent one we might call "The Prison League".
Now, imagine that a million times over when the collapse happens. You absolutely DO NOT want to be in a city when it happens.
There will be no coaches or referees to intervene.
Even if the girl did intentionally trip her, there’s no excuse for that kind of reaction. She was literally trying to kill the girl. She wouldnt have stopped if people werent there to break it up.