Earlier quoted context omitted.
Yeah the comments are all political and some are less than friendly in their tone. I've found that going too partisan on HN ends in down votes. I'd probably agree with some of the politics they're pushing but I'd avoid bringing that discussion here. It doesn't fit with the rules here and I think the rules here are responsible for one of the friendliest environments online.
Plus, it is likely untrue as well. I am a kid from behind the Iron Curtain and I met quite a bit of Marxist thinking in the real world, including former Communist ideologues (I mean, people who were paid by the Central Committee to develop and spread the ideology full time, not just amateurs). But HN does not seem to be "mostly Marxist", though there are a few "eat the rich" commenters, as everywhere; but definitely…
However, Marxism is a global project. In India for instance Marxists are mercenaries for hire. The network built by the soviets and later coopted by the Americans have their tentacles deep in the English press and universities.
So they do control school textbooks and the minds of the English educated urban kids.
But sooner or later kids figure out this propaganda. And anyway social "sciences" is not what the bright kids aspire to learn.