You have to even wonder about the other kids on the bus.  If that girl is not there, the bullies will find another victim.  

When I was a kid I just hated people making fun of the "retarded kids".  I would tell on them or even beat them up myself.  I hated having bullies in my school.  Most kids would not bully me physically because my parents taught me to hit back twice as hard.  I was taught to take the verbal taunts and throw them back as a joke.  Most of the time it worked.  I doubt this little girl could stand up to bullies herself.  Why were none of the other kids doing anything about it when it first started?  This generation of *** for brains will grow up to raise the same type of kids.