There used to be less of that on HN, my theory is younger accounts that are more politically extreme/lefty are now here as the younger generation graduates school and posts more on HN.
There's some historical irony too since communism came out of highly educated academic elites and is responsible for an enormous amount of death and value destruction. Ideological driven academics that think they're better than everyone are particularly good at crafting insane ideologies someone outside of that insular community would not, then leveraging institutional and cultural power to force it on everyone else. The woke and gender ideologies share similar origins, same for DEI.
It's a political and ideological monoculture and it's a dangerous mixture of incredibly confidently smug and wrong.
Worth picking up Peter Thiel's first book which goes into this in some detail (he wrote it pretty young, observing the early start of this when he was at Stanford). It's wildly prescient and was from the mid 90s iirc.