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...IIRC (and I might not, it's been a while since TH was closed), the whole reason it existed was to have some place where the potty mouth rants and genuinely deranged threads/posters couild be isolated, when needed, so the content doesn't show up on various public search engines. I know teh P+R is restricted to invitation only, but the contents do show up on search, even on the bikeforums.net search engine.
All of this might well have changed in the interim. I don't keep up with the technology here. But the original reason for Trollheim was to keep the most embarrassing and possibly controversial stuff isolated in a separate place. And you didn't have to ban people, you could just lock them in there for a while to vent.
Anyway, good luck with it, moderation team. Sooner or later if you run an internet platform, you need to come to terms with conspiracy theories, and whether you choose to provide a soapbox for them (however tiny the soapbox.)