I don't think "growing polarisation" is the right framing here. It gives way too much weight and legitimacy to views that have to be subjected to cordon sanitaire [1].

It's not acceptable to associate race with national identity (DHH's London post). It's not acceptable to call for ethnic cleansing (his post on Travellers). It's not "just another view, couldn't we all get along"; we can respectfully disagree on small state vs large state, on low taxes vs high welfare, on isolationism vs interventionism even, but DHH's views have to be unacceptable.

What is happening is a number of very rich, powerful, well-connected men (and sometimes women, see AfD) are trying to normalise those views and demolish the cordon sanitaire. "It's just another view" and framing this view as legitimate, just polarised, is one of their tactics. It's a moral duty of anyone remotely believing in the OG liberalism (you know, that people are equal regardless of their skin colour or ethnicity) to not let them.

[1]: https://en.wikipedia.org/wiki/Cordon_sanitaire_(politics)