Racism is a thing. Sexism is a thing. Homophobia is a thing. Poverty, difficult childhoods, disability, immigration status, gender dysphoria — these are all things, too. And if you’re looking for real viewpoint diversity in an organization, you might want to look for people who have these intersecting identities.

(My emphasis.) You think you're going to find diverse viewpoints in that crowd? You're not ALLOWED to have opposing viewpoints.

If you put the average leftist and a brick side by side and conducted a test to see which was more productive. The brick would win in a landslide.