When I first read this, I thought, "How could the bus driver not try to stop them?" Then I saw the video. Wow - what violence. I would have tried to jump in but I can see how the bus driver wanted to stay clear.
Are there any criminal charges being brought up on the kids that were beating that kid. It is called assault with intent to do harm and it is a crime. And since their parents have done such a lousy job raising their kids they can pay for their defense and long term psychological therapy to deal with their violent behavior.