even if trolling, i feel obliged to post to clarify some things.
What you said is kinda, but not quite, true. There are certain populations and regions in the us that do not have enough physicians. Trying to get physicians to go there to practice medicine is also difficult because, frankly put, there are reasons why physicians do not want to live or practice there. The thought process is that if medical schools recruit students from those regions, the physicians will be more likely to practice medicine there.
Also, sometimes people do not go in to physicians because of cultural or language boundaries. Having a more diverse population of physicians ensures there will be a matching physician for each patient (if that is what the patient wants), whether that be a physician fluent in their language or one that grew up in their surroundings. You have to admit, having a physician who grew up in rural kentucky probably doesn't know much about gangs, illegal drugs or the neighborhood structure in queens.
Many people are quick to attribute success in getting to medical school because of urm status. However, these people have faced way more hurdles than you have probably ever realized. The same applies to socioeconomically disadvantaged and that is why schools also give a slight preference for those students.