That's because liability demands they take all 40 kids on the bus to the ER if any of them are so much as shaken up.
The national agency that keeps track of school bus safety claims that buses are safer than cars. However, when I checked their website, they compared school bus stats to all children in cars during those hours for what ever reason. This would include teens driving other teens. They did not compare parents or guardians driving to and from school with children securely fastened in seat belts.
Roughly 200 times as many children are killed in car accidents as die in bus accidents during school hours, which is all the more impressive when you consider that well over half of children are bussed and don't have an oppurtunity to participate in the car death statistic. Yes teens are dangerous drivers, but they aren't carrying the whole load themselves.
The bus death epidemic is a creation of the sensationalist press.
I have never seen that statistic. I doubt that it is available because if it were it would make school buses look as bad as they really are.