I always disliked the conspiracy theories tag. First of all, it's a meta-tag but secondly, it's pejorative and slanted. As Neil deGrasse Tyson put it so well on Twitter,
Conspiracy theorists are those who claim coverups whenever insufficient data exists to support what they're sure is true.
I remove it when I see it, but at least five questions are still tagged with it and it's likely that it's a tag we'll see reused in the future.
Jeff, could you just blacklist it, please?