I know that you do not care about the needs of underserved communities but there is a huge need for physicians to work in these communities. That means being able to earn the trust of those communities and being willing to commit to serving those communities. Students who pursue medical school for the status and the bucks are not likely to serve those communities or to serve them well or for long.
No doubt. But...
THAT is why there is such a drive to recruit and admit med students from across a broad range of demographics.
... that is not a parsimonious explanation. That is a dinosaur egg explanation.
Back in the Tang Dynasty when I was a kid, the Yucatan meteorite impact at the time of the KT boundary hadn't been discovered yet, and the popular press's prevailing explanation for the extinction of the dinosaurs was that mammals ate their eggs. This was clearly an incorrect explanation even if nobody had a better one at the time. It was clearly incorrect because at the end of the Mesozoic Era, 80% of animal species went extinct, not just dinosaurs. Something really bad for ecosystems evidently happened all over the world. The hypothesis that everything else died because of a natural disaster that didn't also wipe out the dinosaurs, and coincidentally mammals got really good at eating dinosaur eggs at about the same time, multiplies entities unnecessarily. It is much more probable that whatever killed off the ammonite mollusks and whatnot was sufficiently un-picky about what it was killing to take out the dinosaurs as well. One cause is more parsimonious than two.
Universities in general are engaged in a massive drive to recruit and admit students from across a broad range of demographics. This is not because there is a huge need for art history majors to provide art history services in underserved communities. If your hypothesis about med students were correct then there would have to be two unrelated causes that independently result in the same behavior pattern in university admission officers. That multiplies entities unnecessarily. It is much more probable that whatever motivation causes Harvard admission officers to lie about Asian applicants' personal qualities as an excuse to hold them to higher academic standards than students of other races is sufficiently un-picky about its collateral damage to take out medical school applicants as well. "There is a huge need for physicians to work in these communities" appears to be a post hoc rationalization for a policy that was originally adopted for some other reason.
(The obvious parsimonious explanation, accounting for undergraduate and graduate admission patterns alike, is being openly displayed by the author of posts #325 and #326 and by the four people who "Liked" her blatant illogic: Western Culture is evidently hosting a widespread religious belief that people are interchangeable representatives of the ethnic groups their ancestors belonged to, that certain occupations' ethnic composition ought to match that of the workforce at large, and that discrimination can be measured by lumping people with those they look like instead of by examining the decision-making process. The hypothesis that university policymakers are typically infected by this parasitic meme simultaneously explains both medical school behavior and university behavior in general, with no need for multiple specialized explanations for different subcategories of institution. But it might be something else. Either way, one cause is more parsimonious than two.)