The hypothetical danger. The alleged danger. Note that it was alleged dangerous by someone whose living apparently depends on scaring people about machine intelligence. So: now we have the danger-that-is-too-awful-to-even-think about. And where is the evidence that it is actually dangerous? Oh yes: that was all deleted - to save people from the danger!
Faced with this, it is pretty hard not to be sceptical.
I really don't have a handle on the situation, but the censored material has allegedly caused serious and lasting psychological stress to at least one person, and could easily be interpreted as an attempt to get gullible people to donate more to SIAI. I don't see any way out for an administrator of human-level intelligence.
Some research says that lurkers make up over 90% of online groups. I suspect that Less Wrong has an even higher percentage of lurkers than other online communities.
Please post a comment in this thread saying "Hi." You can say more if you want, but just posting "Hi" is good for a guaranteed free point of karma.
Also see the introduction thread.