In the 60's I watched swearing, throwing objects and cigaretes, rolled pot and sleeping often in school. I smelled teaches of alcohol, knew of teachers flirting with girls, girls sitting in front legs apart to get good grades, it was not all that good as so many want to think it was. Fighting went on daily, rarely was it stopped, controlled or monitored. I am no fool, I always believed my children, until they proved me wrong. No adult was going to come before my child. That so many did not believe a child is why so many abusers got away with doing harm to those who now adults won't believe them adults and do not want you touching our children.
The Schools do and can have alternate education for the disruptive and those who cannot behave in normal classrooms. If the teachers do thier job and show that is needed, it can accomplish much.
There should be no reason to fear a law suit, we have legal systems, police to call and courts.
If no one takes the law into thier own hands, anothers childs rearing as thier place, they won't have to fear it? Class rooms have been out of control since the mid 60's steady increases has not caused the changes needed.
Teachers are not babysiters, replacements for parents nor police or social workers, they are educators.