The segregated Black (Colored in those days) schools might have been separate but UN-equal, but they had teachers and administrators that could raise productive citizens.
Black kids are desperate for discipline. Discipline means love. As in if there is a man in their life, he either abuses them or ignores them. A loving father disciplines (socializes) his children. They grow up with usually a strong mother, but no father. So, they get into another environment, and they push the envelope hoping that some loving person will push back, show them boundaries and love by expending the effort required to socialize them. Under the current liberal left they turn into feral animals.