The important thing to understand about eliminating racial preferences in college admissions is that doing so does not lower the number of minority college students, it just redistributes them to schools for which they are actually qualified, rather than catapulting them into academic environments where they will inevitably struggle.
One of the greatest accomplishments of Western civilization is the development of the scientific method and the scientific disposition, which entail the development of falsifiable hypotheses about the world and the unwillingness to take unverified and untheorized claims about the world as truth, simply because someone states that they are true.