Over at Althouse’s place:

Strangely enough, “progressivism” was broadly associated with eugenics and racism and yet the only people who remember that are the people accused of being social darwinists.

There’s a lot more to unpack here than I have time for, but a key point made by another commenter is that no one calls themselves a Social Darwinist — it is an illegitimate epithet reserved for the perceived enemies of same, whereas many have been, and continue to be proud to call themselves Marxists and socialists. And they should be ashamed to do so, given the history of the twentieth century.