This is like when you ask Pres Bush why he went to war, and you keep getting a different answer everytime...
The stated objective/reasoning of AA is to "increase the number of under represented minorities in the legal profession." How does having someone go to Columbia instead of a lower school achieve that? I have seen evidence to the contrary. They have empirical data which shows that URMs which go to schools that are way above the ones they are qualified for flunk out at a much higher rate than those that go to the schools that are on par with their numbers. Thus, giving URMs a boost in admissions can actually lead to a REDUCTION in the overall URM presence in the legal profession.
There are alot more poor WHITE students who cannot afford to take the same prep tests as URMs, so that argument is invalid. You are saying URMs should go to better schools and get better jobs solely because they are URMs. Even when they are less qualified. Even when instead of brining races together, AA is fostering new animosity.
If they go to the schools they are qualified for, they will still be lawyers, and thus will be making more money than people who live in their "poor communities." And if this magical trickling down of success that is supposed to solve all the problems in the black community really works, then it will happen anyway, with or without the boost in admissions.