As a learner teacher, our lecturers drum into us how important it is to create a safe school environment where children are free from harm, and it doesn't sound like your school is providing that for your DD and the other children. It's hard when he does seem to have a lot of issues, but they really need to be working with him on that so he can learn to control his outbursts because it will only get worse as he gets older if he isn't taught now. I'd be making an appointment to see the Principal and her class teacher to see what can be done, because this is going to start impacting on her to the point where she will flat refuse to go to school. And surely there are other parents who aren't happy about this either, so the sooner it is dealt with the better.