To start with, intervene each and every time a child is bullied. Those who are somewhat stronger will probably be OK, although damaged. Those who are not, will snap, one way or the other.

This is turning out to be another bullied child case...although probably 50% of American children are bullied one way or another.

Do not tolerate schools or bus drivers looking the other way. Make this clear at hiring them that the safety of children is their first command. mg