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I'm in a similar boat, to be fair, I had them down as a troll given that it was a brand new account on a relatively niche forum, and only talked about something that had nothing to do with that niche. Hence being interested in why they signed up. Given the lack of answer I figured my assumption that they were a troll was right. Obviously I could be wrong in that assumption, but nothing that I've seen gives any weight to that option.
I agree that it's useful to engage with people like this to get an understanding of how they come to hold their views though.
After my thoughtful and engaging questions they sent me a pm. Obv anti vax, but not sure they were just trolling. I find it interesting to talk to people who (genuinely) have these views and work out how they have come to them.
It could become a problem long term if the anti covid-vax spills over to MMR, polio, smallpox etc