Creationism was discussed to death long before Lesswrong existed, which is why people downvote attempts to rehash it as a waste of everyone's time. To the extent that Neoreaction is something different than plain old Reaction, a) it's a relatively new memeplex, so if it's bad, someone has to do the work of swatting it down, and b) when the Neoreactionaries aren't busy reviving obscure archaic words for their own jargon, they're using Lesswrong-style jargon. You run the risk of outsiders pattern-matching LW and Neoreaction together either way. I'd prefer the association be "Lesswrong is a place where neoreactionary ideas are discussed and sometimes criticized" than "Lesswrong is that place that sounds very similar to Neoreaction minus the explicit politics".

That being said, there's ample discussion already on Slate Star Codex, and I wouldn't want to see it crowding out other topics here.