I don't know the specific reason. I'm confident whatever it is is not something that would serve as a chapter in "the Bell Curve....." If you are insinuating the committee is latently racist? Possibly. I would venture the structural differences of society at large and additional burdens visited upon racial minorities causes an underrepresentation of their best and brightest into the institutions of higher education, as well as a good dose of the fact that you can't construct a CERN supercollider when you are focussed on trying to raise enough rice to eat that day. I'm sure its an admixture, a rich tapestry.
How would I know. I'm just an idiot.
surely someone should have won by now?