Inaccurately polarized ideas about Thiel's politics

That depends on how seriously people take the possibilities speculated upon, and there's no real reason to take idle speculation seriously. Perhaps we should credit other posters with the capacity for practicing basic epistemic hygiene?

general divisiveness and hostilities between LessWrongers

This could be caused by any contentious topic. You could draw a distinction between productive/necessary friction and useless friction. Though I don't share your dour view of the local capacity for political discussion and thus don't anticipate a ruckus - perhaps your mileage has varied.

a fantastic opportunity for politically motivated trolls to come out, and spillover nasty rumours with regards to Thiel himself

Thiel has been accused of self-promotion by another commenter in a somewhat glib fashion, so that seems to have happened, though any discussion of Thiel and his ideas could invite similar comments. Don't see how that could be avoided bar avoiding all discussion of Thiel (or anyone else who's disliked by some other people).