The bottom line (for me) is that diversity at universities and other organizations is either good, neutral, or bad. We've (mostly?) collectively agreed diversity is good as diversity in sex/age/race bring diversity in thought, which presumably results in more innovation/competition/challenging of status quo/etc. The only way to increase diversity is to practice negative discrimination on dominant groups or positive discrimination on minorities...
Either that or universities need to dedicate a large amount of funding marketing to minorities so that they get more competitive applicants from said group. However, discrimination is easier and cheaper to implement.