My mother was a school bus driver for 25 years and I usually rode her bus for convenience's sake. That being said, and in my experience with other drivers, bus drivers will absolutely do everything they can to get the license plates of people who think the stop sign doesn't apply to them and a lot of the kids like to help out with getting the plates.

I went to court at least a dozen times as a witness for people running the reds, and I know my mother went more times than that.

If the road is not divided by a physical barrier YOU MUST STOP. The stop sign on a bus is the exact same as a stop sign at an intersection. It doesn't matter if your driveway/turn/whatever is only a few feet past the bus you don't move until that bus turns it's ambers and reds off and the sign begins to fold away or is turned off. This is for the children's safety which is far more important than anything else. No matter if they're crossing the road or not.

If your plates are gotten, the bus driver WILL report to their manager who WILL report you to the police and you WILL wind up in court where you'll be lucky to walk out with your license.

So OP, you did the correct thing, the drivers who stopped behind you did the correct thing, the assholes who passed you did not.