The other thing is.... you can't admit people to colleges, or hire them for jobs, if they don't apply in the first place.

I used to work in an ice cream store when I was in college. We had a mostly white crew, in spite of being near a largely black neighborhood, and between two colleges. The reason? Most of the people who applied to work there were white.

If institutions want to vary their racial diversity, then first they have to appeal to minorities to apply.

Then there are schools like Fisk University, who are quite happy to be mostly black, thank you very much. They don't want to increase their diversity.