You aren’t.

So we live in capitalism. So usually the presumed deficiency is that historical their families were denied opportunities and therefore the candidate has had inherited a lack of opportunities, or would otherwise face a lack of opportunities.

Family capital is very real. Racism is still very real. It’s not that your black doctor had bad grades and shouldn’t have gotten into medical school. It’s presumed he had less opportunities than his white peers who scored sliiightly better, and besides the cut off doesn’t imply lack of ability, it implies a limit on seats in medical school.