The Defense of Toxicity section reads to me like a defense of Linus Torvalds or Richard Stallman.
Torvalds has apologized for past toxic and the damage it incurred, behavior and has vowed to do better from then on.
I don't pretend to know whether Vitalik's theory is true, but it certainly seems plausible. And defending linux from bad actors is a herculean task. If Torvald's toxicity helped him in that endeavor, his apology would be a negative development.
Interestingly, the Rust community has had incredible success being explicitly anti-toxic. It's a wonderful community that I enjoy. Rust is also now reaching a level importance that it will be a target to be coopted as described by Vitalik, as prominent members of the Rust community have expressed concern over [0].
[0] https://twitter.com/steveklabnik/status/1437441118745071617