I'm Asian. I was lucky enough to get accepted to a pretty prestigious university. And I say unequivocally that White/Asian/South Asian are over-represented at the top colleges. All of them brilliant, but when everybody comes from the same background, there's very little room for diversity of thought. Something an institute of higher learning is supposed to foster.
A nebulous, intangible, undefined, impossible to define concept. "People that look different physically" as a proxy for increasing the purported "diversity of thought" is a superficial, nonsensical legal fiction drummed up as some paramount argument for continuing affirmative action. It's the equivalent of the "student athlete" justification for not paying college sports athletes: it's true because it must be, because if it's not, the house of cards collapses.
Intelligent men devised this fiction and sold it to other intelligent men (on the SCOTUS at the time of Bakke) as a moralist side-step on the formalist legal arguments that otherwise threatened affirmative action.
Here, the "house of cards" is the problem of formalist legal arguments that would prohibit any sort of contemplation of a person's race, ethnicity, national origin or other classification that arises to "protected class". People who understand the necessity of affirmative action but understand the legal troubles of outright saying "we need to favor black people in college admissions, even slightly, because of a million reasons owing to the historical vestiges of slavery, Jim Crow, institutional racism, etc." successfully couch their argument in the "diversity is a goal of college" language. The argument in favor of AA is
right morally, but it's troublesome in a legal formalist sense. Thus, change the characterization.
"Diversity of thought" as the mission of colleges, though, is a totally meaningless fucking concept.
EDIT: "Diversity on campus" plays so well for colleges because they get to imagine themselves as the curator-demigods of a mini-ecosystem, where the students are the plants and animals, and they get to pluck and stem and plant different varietals and introduce some "exotic" species (we have one kid from
Idaho!) and watch them intermingle and interact, all in the name of elevating the lives of all involved. For those who fully buy into the mission, it's self-congratulating masturbatory god-complex bullshit. For the rest, it's a necessary justification for a badly needed program to help, in whatever big or small way possible, alleviate the problems facing poor minorities in America.
I should state, at the end, that I'm not saying diversity on campus is no better/worse than a homogenous campus. It's better. It's importance, however, is overblown to holy hell because it just
sounds so good.