Cos its a school, and this is where a child is taught how to act in the world.
Obviously - the problem starts at home,as I think Billy mentioned earlier - but there needs to be something more strict in place at school, so kids don't think they can get away with murder. I've seen some of the little ***** knocking about around my area who are 16-17. They think they can go around, doing what they want and saying what they want. I went to school with them too, and they did exactly the same thing.
Now I don't know if this is because their parents simply didn't give a **** and let them have free reign of the house, or if it was because our headmaster and teachers at school simply weren't strict enough on them. It's my firm belief that there needs to be something in place, not necessarily the cane, in order to keep specific children on the straight and narrow - the ones who think they can break the rules, that is.
There is absolutely no respect in the classroom nowadays for the teacher. Some teachers may act like dickheads, but maybe that's a good thing? Playing the idiots who do it to them at their own game.