They just want to silence dissent and keep the discussion running only in their echo chambers.

You can still open PRs, like this one:

https://github.com/Plan-Vert/open-letter/pull/32

sigh

I’m sure they don’t care today, but since these people proudly slap their names on their jeering comments, I imagine that someday their leftist children will read them feel disgusted at the mocking cruelty. Will the authors feel shame then, I wonder? The present political climate might make them feel righteous and invincible, but it is only a feeling.

> their leftist children

you are not ready for what's coming

I think you’ll find yourself sorely disappointed in a decade or two.