Another part of it is the social programming. If you're an uneducated poor white male, it's easy to see a path into construction. If you're an uneducated poor black male, going into construction might as well be becoming an astronaut. Or to flip that around, imagine being an uneducated poor white male in Cleveland, Ohio and suddenly believing you could easily be a successful rapper. If your family, friends, neighborhood, media, etc don't show a clear path towards that role, you're not gonna seek it out, even without all the other barriers.