The school I went to did not suffer so much from assults on teachers, but had a horribly high rate of bullying, both physical and mental.
I suffered from several vicious physical assults during my time at school, the first time I, very properly, told my mother, who recomended I write down what had happened and other incidents of bullying, and give the statement to the head teacher, my form tutour and our head of year.
I did. It seemed like a good idea, I wrote down the injuries I sustained (some serious bruising to my legs and back, cuts and grazes and a bump on the head) and the chain of events leading up to it, named names, and handed it in.
Great, they can't ignore hard copy evidance we thought.
The response, to call the perpetrators into the head of years office and say "please don't do it again". Nothing else.
A few weeks later I was assulted by a fellow pupil after a games session, she punched me hard in the stomach in front of several whitnesses, I couldn't breath after that and was lying on the changing room floor turning blue (according to friends). The P.E teacher who had been called by someone (and put into posession of all the facts!) appered and told me to "stop being silly". She then plesantly told the girl who had hit me to "finish getting changed dear" and walked off, no action was taken, probably because I was not popular with the P.E department and she was.

My point is that this kind of viciousness is endemic and is propped up by a legal system which will take the word of the bully over the word of the victim. Bullying is covertly encouraged and those of us on the recieving end end up damaged for life be they adults or children.