Even before he took over Twitter, Elon Musk touted himself as a “free speech absolutist”. This was always a troubling notion for an insanely rich guy with a cult following whose sense of history is as limited as his ego is boundless. As it turns out, what Musk had in mind was something more along the lines of “free speech for me, but not for thee”, as the title of the revered columnist Nat Hentoff’s 1992 book put it. A few days ago, he threatened to sue the Anti-Defamation League – for defamation, no less – blaming the non-profit for...