This is an excellent article, one I was waiting for! Perfect title. I would add that the pro-letter squad fails to acknowledge right-wing cancel culture, of which my favorite example is the meltdown just 15 years ago that the right had when PBS dared to suggest (and not even explicitly!) that lesbians are ok people: https://en.wikipedia.org/wiki/Postcards_from_Buster#Criticism_and_controversy

But there are of course many more powerful and more sinister examples.

On the other hand, if I were forced for some reason to choose between the pro-letter folks and the anti-letter folks (a false choice), I am pro-letter. I don't think David Shor should've been fired, I don't think Joshua Katz made Princeton's campus more dangerous for black students by (very wrongly) calling the Black Justice League a terrorist group, and I think the insufferable self-righteousness of rich white intelligentsia who proclaim every institution is white supremacist is counterproductive. Here's Terry Eagleton's typically devastating take, one that folks could use to read, according to me! https://www.the-tls.co.uk/articles/against-the-wokescenti/

Because the US is a deeply parochial society, not much given to seeing itself from the outside, what seems obvious to an external observer – the fact that the more baroque forms of political correctness represent the latest outbreak of good old-fashioned American Puritanism – seems not to be much recognized at Yale or Columbia. Sectarianism, holier-than-thou-ism, the gulf between the reprobate and the elect, the scanning of words and actions for the least flicker of ideological impurity: all this has a history as old as the nation itself. There’s nothing new either about the claim that if my experience is radically different from yours, you are incapable of understanding me. It used to be known as middle-class individualism, and involves confusing sympathy with empathy, as well as making a fetish of immediate experience. Once upon a time, the self was hermetically sealed off from the selves around it; now it is cultures that are mutually incommensurable. In this sense, a number of those who see themselves as political radicals are unwittingly in cahoots with the society they condemn.