Is I read it, the policy does not address the basilisk and basilisk type issues, which, while I don't think should be moderated, are. "Information Hazards" specifically says "not mental health reasons."
Well, the "LW basilisk" just turned out to be a knife sharp enough to cut yourself with. And sometimes you need sharp knives.
http://wiki.lesswrong.com/wiki/Deletion_policy
This is my attempt to codify the informal rules I've been working by.
I'll leave this post up for a bit, but strongly suspect that it will have to be deleted not too long thereafter. I haven't been particularly encouraged to try responding to comments, either. Nonetheless, if there's something I missed, let me know.