I was told a story that relates to affirmative action in a way.
A coach was once asked if, given two athletes that could run from one end of the field to the other in the same amount of time, same grades, same build, same height/weight, except one of them had excellent form and the other had lousy form, which would he recruit and/or want on his team. The answer? The one with lousy form. Because the one with great form is fine, but the one with lousy form can be trained to be even better.
Similarly, if you have two people equally qualified, and yet one has raised themselves from the ghetto, and the other has come down from Hyde Park (affluent part of town), pick the one from the ghetto. They are going places, and will improve faster than the one who didn't.
Interesting way to look at it.