Why do you doubt we could act collectively? How could we compete effectively when other peoples use collectivism as a political tool to get benefits from the society on a political level?
Why not just say that instead of saying "that black school won't work" kinda line? I don't agree, but you would at least sound less c00nish. Besides, how well are public schools doing now when it comes to reaching black students? I'll answer that for you...they're not doing great at all.
Peace
Because American culture does not allow for collectivism, especially for the powerless minority.
Public schools are tools. Blacks have to make use of that infrastructure. Nothing more or less.