If a bully can get his thrills beating others and get nothing but a vacation in return, he will continue beating others.
If a school administrator can punish the innocent and still hold his job, he will continue to punish the innocent.
What would be a disincentive to these parties? That's easy: hit them where it hurts.
A bully, being what he is only responds to physical force. The picked on child must severely injure the bully each and every time he instigates a fight. The more severe the injury, the quicker the lesson will be learned. Injuries that require hospitalization of the bully are not too extreme. Krav Maga and similar martial arts should be sufficent for even the smallest child to adequately defend himself.
A school administrator will only respond to a threat to his wallet. Pulling the child from public school will deprive the school district of funding, and therefore endanger the administrators position.
These responses by bullied children and their parents must be consistent and predictible. Only then will bullies and administrators be instilled with sufficient fear of their victims.
I've been taking Sombo for several years and I've been teaching it to my nephews and I ALWAYS stress this point; NEVER START A FIGHT, BUT IF YOU HAVE NO OTHER CHOICE BUT TO FIGHT, END IT QUICKLY AND EFFECTIVELY.