I could be misunderstanding, but it seems to me that this author is saying that freedom and diversity are somehow at odds and that the two values generate conflict, even violence. That suggests the standard protest against 'political correctness' that it is about 'liberals/progressives' dominating all others with their perspective on what attitudes are permissible in society.

I do take 'PC' to be a crude, ham-fisted attempt at enforcing mutual respect as a societal value. Mutual respect, properly understood, is the antithesis of any person or group dominating any other.

I assert that we could transform our society by accepting that the ethic of justice, the ethic by which society must be governed, is mutual respect of a basic kind--taking one another into account. Mutual respect already informs the theory of democracy. A nation governed by mutual respect would, as a practical matter, maximize the liberty that co-existing people can share simultaneously. ["Equality Is All We Need"

here in Medium (Links are apparently not possible in this new Response platform.)]

Mutual respect can be efficaciously applied to the existing economy, with astonishing results for society: "For Crying Out Loud, ACCEPT That A SOLUTION Actually EXISTS" (a "3 min read"--including options for further reading--also here in Medium).