Many mostly black schools resemble battle zones or areas or semi-organized chaos. What good teacher wants to go into situations where they’ll be subjected to indifference at best and possible violence from their students at worst?
Yes, I think about one company of Marines per each Public School with orders to maintain Order at any cost up to and including DEAD would be just about the right amount of FORCE it would take to make these feral black males sit down, STFU, and behave!
Until that day comes, no highly qualified teacher is going to risk his/her life to try and teach these chimps how to add 2 + 2.