They should appoint the toughest guys on each bus to be “monitors”.
They usually appoint themselves........
We saw what happened recently with the adult bus monitor. She was bullied mercilessly by the kids.
Unfortunately, in today’s politically correct world, she wasn’t allowed to say or do anything against those kids.
Back in my day, there was no such job as a bus monitor. But it seems that such a job is useless, since monitors aren’t allowed to discipline the kids.