If I answer this question honestly, I will sound "racist". But the answer is simple. Let's say I told you if you needed ~3.2/25 to get into med school. Do you think many of these applicants would have 3.8s, 3.9s, 4.0s and 35+ MCATs? (answer is hell no). What happens when you have a high bar like US MD school admission for "majority" applicants, you get those 3.8s, 3.9s, 4.0s because you know how hard it is to get in and the chances of getting in med school are low unless phenomenal grades/MCAT scores are achieved.
For URMs, as Raryn nicely displayed, average african american needs 3.4/27 MCAT while the average white american needs 3.7/31 MCAT. If I was an African American, I'd be fully content with my current 3.45 GPA (which I really do have entering junior year) and I'd say I'd probably try and raise it to a 3.5->3.6 or so by graduation in order to secure my chances. BUT of course I cannot check that box that makes the application process FAR easier, so by graduation even with a hard-earned 3.6-->3.7 I will still only be around "average" for white matriculants.
Basically my POINT of this entire argument is that the lower you set a bar, the lower applicants will achieve and the less they will ultimately work. It works the opposite way as well. If the average GPA in a decade or two became 3.8 for all med schools, we wouldn't all of a sudden have no doctors. We would have even MORE competitive/neurotic pre-meds but we would still have people getting those grades instead of getting around the current averages. The only way for URMs to get the same grades, qualifications as every other med school student is for us to stop giving out these unfair advantages and to make the race card extinct.
And I hope I do not sound like some white bigot. For anyone's information, I am not white. Not a single person I meet can pronounce my first OR last name. I am from a rural area in Los Angeles. My family is not rich. I think that applicants should ONLY be considered disadvantaged if they are such - disadvantaged. I know a few majority kids who have had to drop out of college because the financial aid around was not enough. But for some reason all of my African American friends who apply for college financial help get more than enough scholarships/grants to make it easily.
Just what I see from firsthand experience and I am sorry if this offends anyone, but it needed to be said.