Conco Bonco #racist chimpmania.com
I'm going to go out on a limb and suggest that it's because they are, well..., niggers?
Of course the ultimate solution will be to dumb down the exams a little (lot) further so that every little spook can be a "genius."
That will surely even the playing field—somewhere between rock and tree stump—and the snowflakes can shout about how embracing cultural diversity has made us all better people.