I'd just like to insert a little tangent here: Roko's post and the select comments are the only things that moderation had any effect on whatsoever since the launch of the site - if I remember correctly. I don't think even the PUA wars had any interference from above. Of course, this is a community blog, but even this level of noninterference is very non-typical on the internet. Normally you'd join a forum and get a locked thread and a mod warning every so often.

Additionally, that on LW we get this much insight about the workings of SIAI-as-a-nonprofit and have this much space for discussion of any related topics is also an uncommon thing and should be considered a bonus.

May I at this point point out that I agree that the post in question should not appear in public. Therefore, it is a question of the author's right to retract material, not of censorship.

Eh, if the stuff hinted at really exist, you should release it anyway. I expect the stuff is not really that bad and you'll hurt SIAI more with innuendo than with the stuff.