Everyone has some level of bias. The best thing you can really do is try and counter your own bias when you notice it. In most jurisdictions not hiring someone based on racial or unfair judgements is illegal. Trying to change workplace culture away from meritocracy for the sake of diversity might sound noble and well intended, but just as 'meritocracy is a lie', so is diversity in that sense.
Hiring people based on how much diversity they provide based purely on their gender, race, etc is prejudice in itself, even if well intended.
I agree with you that everyone has some level of bias, but we disagree on to what degree people are biased. Race is a very complex issue in American society. It permeates everything: politics, economics, academia. And it's visually obvious. The evidence is pretty clear to me (all the statistics related to how racial judgments are made, how stunningly often resumes get rejected if they have names that sound like they belong to certain racial groups), that race plays a very large role in people's snap judgments of others.
Hiring people based on how much diversity they provide based purely on their gender, race, etc is prejudice in itself, even if well intended.