Diversity and multiculturalism don't work for this basic reason: a legal system, and by extension the country, can't function for long when it's perverted to apply different standards to the diverse peoples. For example, if you have a health condition and you want to make a doctor's appointment, then the swiftness of the response will depend on your race.
“Offering preferential care based on race or ethnicity may elicit legal challenges from our system of colorblind law,” Harvard Medical School professors Bram Wispelwey and Michelle Morse wrote in the piece. “But given the ample current evidence that our health, judicial, and other systems already unfairly preference people who are white, we believe — following the ethical framework of Zack and others — that our approach is corrective and therefore mandated. We encourage other institutions to proceed confidently on behalf of equity and racial justice, with backing provided by recent White House executive orders.”
Diversity = Fuck you, White people.