I appreciate the more thoughtful response.
That being said, I want to address this:
This is actually exactly what OP's article argues. It's a study about the implications of offering acceptance based on test scores alone. A lot of people in this thread have actually
FWIW, I think that the actual process that elite colleges use is pretty damn close to what you're advocating. It's not that they're throwing white students' applications in the garbage.
What typically happens is the admissions office will first identify the highest-performing applicants (based on GPA, SAT/ACT, etc.) and grant those kids admission first. Race is not a factor at this point; the VERY best students get in regardless. (This is also the point at which "special" applicants like athletes, donors' kids, international students, and the very wealthy are granted admission.)
Once that's all out of the way, the admissions office starts the hard work of deciding who isn't going to be granted admission. Unless the school is test-optional, they'll typically pick a "floor" (based on GPA, SAT/ACT scores) and no one under that threshold gains admission, regardless of their racial identity or other factors.
The admissions office is then left with a hard cap on the number of remaining applicants they can accept. (At elite colleges, this is going to be a huge number of applications.) THIS is the point at which affirmative action comes into play.
If you have 1,000 remaining spots and 10,000 applications - all of which have scores between the previously-established floor and ceiling - you have to decide who gets in and who does not. All of these kids are on the bubble already; the truly highest-performing applicants (of all races and socioeconomic backgrounds) have already been accepted. You could just pick a higher "floor" and only grant admission to people above that threshold (think, the effective qualification time for the Boston Marathon vs. the published qualification times). The problem with that approach is that you end up with a very white and relatively mediocre applicant pool. The applicants of color are, on average, more likely to possess a test score that under-represents their potential. The college also wants a more diverse student body than what they'd have if they simply used test scores as a threshold.