As a whole? No. But only because Hacker News is not a monolith, and there are many groups with various viewpoints here.

Are there pro-fascist posters here? Absolutely. I've seen full throated advocacy for some vile things here. The worst of it usually gets flagged.

Is there a strong correlation between flagging political posts and support for fascism? Not necessarily. Although some of that is definitely the HN Trumpist/right-wing contingent, this forum harbors a particular distate for anything not explicitly tech related (often beyond what the actual site guidelines state to be on topic) which includes politics of any kind.

And HN is designed so that flagging and downvoting has a much greater weight than upvoting, so it really doesn't even take much to tank a thread.