I have a hypothesis that most of the students causing problems at today's public schools are the result of problems at home; be that a lack of resources, parents whom society hasn't given the time to be parents, or a lack of knowledge about how to be a good parent.
Better social safety nets and support for everyone should be an real investment in the future for everyone.
My SO has taught in some rough schools and home issues are part of the picture.
It also seems like especially disruptive kids need to be moved into classes with increasingly smaller numbers of students. That way teachers can more fairly provide for the needs of everyone.
Of course this would all be more expensive. So as a society we'd have to agree such solutions are worth investing in at a scale that will make a significant difference.
Better social safety nets and support for everyone should be an real investment in the future for everyone.