Earlier quoted context omitted.
I think the goal of using race in admissions is more about giving disadvantaged people an advantage rather than increasing "diversity of thought".
Assuming people are "disadvantaged" simply because of the color of their skin is a textbook example of "the soft bigotry of low expectations".
Be sure to include the outcomes of racially motivated structural policies into your assessment and you will shortly recognize "the soft bigotry of low expectations" is a different metric altogether (one that PG has spoken on, where the average performance in-group is much higher than overall average, indicating you only hire cream of the crop from that group).