The argument used to justify this racism is that a rich education requires exposure to diverse people and ideas, and so the educational mission of the school re

The argument used to justify this racism is that a rich education requires exposure to diverse people and ideas, and so the educational mission of the school requires that they bring in sufficient numbers of otherwise-underrepresented racial groups. If they can't do this, they say, they won't be able to give their students a good education. Do they present any evidence to support this claim? I'm only aware of studies like that of Robert Putnam showing that diversity is extremely detrimental to community engagement and cohesion, among many other things.