This is not an accident.

If you talk to admissions officers, over drinks, they'll tell you that poor black students from marginalized US communities have abysmal performance at elite schools. The decision to admit rich black students is very deliberate.

There are many reasons why. Schools in the US are locally-funded, and a marginalized community might have 25% of the per-student spending of a rich community (actual, typical figures). Until inequities like that are addressed, there is little elite education can do to help, even if it wanted, which it doesn't.

The point of an exclusive university is to be, well, maximally exclusive. That's the literal opposite of inclusive.