Policy in that area will remain a disaster as long as that denial persists. So liberals have to deal with constant failure, and they are used to it. They have several established ways of doing this. First and foremost, liberals use respectable conservatives to make sure their repeated failures are never mentioned. In 1960, integration was supposed to get rid of what were then considered the incredibly high black rates of illegitimacy, drug use and crime.
Blacks are better off now in some ways, such as pay.
But their RATE of improvement in these areas was just as fast before integration and affirmative action policies were established. So liberal policies are a disaster, as usual. But no conservative who does not want to be shrieked at and then ignored ever mentions such a thing. The reason liberalism always fails is because it always violates common sense. Naturally, liberals sought to deal with those terrible black statistics by dumping the black students in wholesale with white students.