the bus driver should be the one to blame.
so as the school for having such irresponsible driver.

a school bus driver's job is not only to drive a bus. it's also to check the bus and on it's passengers.
what a stupid fella.
At least he should be checking the bus and his passengers(the students) some times. besides they're just kids.
He is the one to blame for that.
He didn't care about his passengers...
He don't know his job. (maybe he thought he was actually driving a bulldozer)