Violence only breeds violence, what lessons are to be learnt from it - it's ok to hit each other. IMO - hitting in any circumstance only shows lack of control and respect.
I was hit as a child and TBH only made me worse - very hard and closed off in side. I had more respect and feared disappointing my grandmother who never raised her voice or hand to me. She made me understand how to behave by talking and removing privileges. Ok, this is home based - but the same applied in school, I had more respect for the teachers who knew how to control a class without violence / shouting.
I think other things are important in school like uniform, structure, a sense of achievement, ambition and a sense of direction for the child. Also, parent involvement is essential.