I'm not using those words literally but as a way of communicating the emotional effect of what I called the shock experience. (Edit: by 'emotional effect' I just mean how it feels.)
Another word I've used to describe a related dynamic is "demons": https://hn.algolia.com/?dateRange=all&page=0&prefix=false&so.... That's a similarly exaggerated usage.
I can't think of anyone who regularly writes on HN whom I'd characterize with such words, even ones I deeply disagree with.
I'd ask you to point me to such a user, but I know that it (reasonably) won't happen given the site's rules. Still, I'm very skeptical.
If someone is espousing things like Nazism or genocide, then yes the label applies, but I've never seen a regular HN user advocate for anything like that.
I think what's happening is that there's a subset of users here who live and/or have grown up in extremely liberal environments, like San Francisco, or university campuses, who view anything to the right of Joe Biden as being "extreme" and "evil". That doesn't mean such people are actually evil, or monsters. It just means they're on the right (often even center-right) of the political spectrum.
And most of the country is entirely unlike urban liberal enclaves. I don't use that term as an insult - many great innovations and ideas come from our urban liberal enclaves. But they're not representative of the country as a whole.
(and for the record, since some will assume my politics based on that remark, I'm neither a conservative nor a GOP/Trump supporter. I'm a centrist/moderate, both by self-identification and empirically - in the form of dozens of political tests).
By the way, just so you don't think this is a general anti-HN stance, it's not. I like HN a lot, and I think that aside from political/ideological issues and moderation, mods do a great job. I also don't agree with the common criticism that HN shields or shelters YCombinator companies. At least, I've not found that to be the case.