Sure they dont... They might not have official quotas, but they certainly are looking to have a ethnically diverse class.
If its not an official quota, then I don't see why people would argue about it? If the school's are going for a diverse class, then race is the equivalent of some other cool characteristic, like being a gifted pianist or a vegetarian.
I do agree with the supply/demand perspective. In Florida there are pockets in the community where a standard caucasian would never think of working... yet someone from that neighborhood may in fact plan on going back and helping the ol'home.
And plus, I roll my eyes every time I hear someone say "They didn't accept the guy with the 35, but the girl with the 30!!! Oh, and she happened to be a minority, therefore it must've been because of her race." That simply can't be true. There are many factors being considered in these applications... it is not all about MCAT & GPA. There is no evidence of discrimination when a school is accepting the students with a lower GPA &/or MCAT. It is not definitive proof, and you gunners have to realize that there is more to the study and practice of medicine than how well you scored in MCAT/GPA. This is why we have Letters of recommendation, Personal Statements, Different Majors, Different Life Experiences, Different Activities, Secondary Applications, and of course, Interviews.
Wise words from a Chair of an ADCOM during an interview: "All of you here today obviously did well enough to be invited for an interview. So don't stress and doubt yourself. Just know... we prefer to accept someone we feel... we can go out and have a beer with."
It would have to be my guess that the ADCOMS really do look at applications holistically and decide how well this person will excel in their program, and adhere to their school's mission.
From the looks of it, if AA is not being practiced but a strive for Diversity, then no one is really getting harmed here- only the applicants that don't have anything interesting other than a good score on the Bio section of the MCAT. The rule of thumb is (and always has been) "stick out" from the other applicants, and this can be done in many ways. But some people can help this more than others.