Note, colleges should not discriminate based on race. But they are under no obligation about their acceptance criteria. They could just use SAT tests if they wanted. Or just grades, or it could be a lottery. Or it could be the best dressed, or who could pay the most. Just because you don't use a mechanism that favors a specific group, doesn't mean that you are discriminating against them (necessarily). For example, most don't use height in admissions, but it doesn't mean we're discriminating against people from the Balkans.