That's a feature not a bug and public school districts should do the same.
Because districts are required to provide education to all students, they should establish special schools that are essentially prisons for children with behavioral issues or daycares for the mentally handicapped to segment the student population when necessary.
I don’t think the parents of the kids sent off to prison and daycare would be all to happy with that outcome. Usually schools that do that do it in a way that doesn’t draw too much attention. It doesn’t take many pissed off parents to tilt the scales in a local election.
It also makes a lot of parents happy. A lot of it comes down to political inertia and the dominance of reactionism.
If you have a system with a dedicated school for violent and behaviorally challenged kids, there would be a much larger number of angry parents reacting to the idea of integrating those students with their children.
Because districts are required to provide education to all students, they should establish special schools that are essentially prisons for children with behavioral issues or daycares for the mentally handicapped to segment the student population when necessary.