I only watched about two minutes. That was enough for me.
On the one hand, these kids are definitely out of control and have no respect for themselves or others. An appropriate punishment would be to kick them off the bus -- maybe if their parents have to figure out how to get them to school everyday, they'll teach their little monsters some manners.
On the other hand, the monitor -- while I do feel sorry for her -- isn't very effective in her job. She's there to control this type of behavior and instead she's become the victim. I wonder if she didn't receive any training, or if the administration doesn't back her up, or if she is just spineless. If the school has hired monitors, it's because they've had problems on the busses before -- surely she's been provided with some punishments? Her presence alone isn't enough to make the kids behave. I don't know what the school has authorized monitors to do, but I'd think she might've 1) had the driver turn around and return the kids to school to meet with a principal, 2) taken down names so she could contact parents and have them kicked off the bus for a couple days, 3) taken a stand when the first few kids started this behavior -- before it became a group thing. Again, we don't know whether she's personally unable to manage the discipline or whether she's tried and isn't supported by her administration.
Having been a teacher for two decades, I can tell you some kids will run all over a person if they perceive that they're going to be allowed to do it. An experienced teacher will shut this down and call on administration for back-up when needed. A new or weak teacher sometimes responds just as this woman did -- allowing herself to remain a victim. In the portion I watched, she didn't say or do anything to try to stop this behavior. These kids are bullies, and while we tend to think of them bullying other kids, they will pick anyone whom they perceive as weak. Maybe she wasn't well informed that the job involved disciplining kids, or maybe she was a poor candidate but no one else was available.
Also, I'm sure this wasn't the first time they'd pulled this stuff. Kids don't go straight to this level of disrespect and bad behavior. I'm certain they started with something smaller, and they were allowed to get away with it, allowed to get away with it, allowed to get away with it . . . and they've worked their way up to this shocking behavior.
Regardless, the kids deserve a strong punishment, and they deserve to be watched carefully in the future -- they are little sociopaths in the making.