A question in regards to school discipline

Honestly, I'd be all for it, I help out with younger students in my sixth form college (UK) and there are completely hopeless kids who get kept behind, yell, scream, make the classes worse for everyone else in them trying to learn, ignore the teacher, ignore teachers assistants, they get at least one detention every 2 days, other than kicking them out of the school, which doesn't really achieve anything because they'll end up somewhere else and do the same thing.

Worse still, the parents don't care, and they have the audacity to blame the school/college for them raising a bunch of misbehaving gits, then not allowing the teachers to give them any effective punishments.