Taking the law into your own bus

So we have the bus lane, which for the most part of respected. But not fully. And I was in the bus the other day and the driver decided not to tolerate the cars driving in the bus lane (and the police aren't out there pulling over a ton of people). So he moved over a lane, sped up, and moved back into the bus lane, almost running the car off the road. This move was repeated more than once to my amusement. I might not have been amused if I was in the car, but I respect the bus driver's decision to make it clear what the rules were. (That and the bus is much bigger).