If you just think that all the troubles stem from the parents, and much are, then you are short sighted. The schools also have some shortcomings that must be addressed. I will list a few here. There is a lack of discipline within schools. It starts at the top with teachers and administrators.
Teachers are late to class.
Teachers are not always prepared. This parent observed that teachers were arriving late to the assembly. The assembly started almost a half hour late. Teachers dress like slobs. Another discipline problem.