So apparently either "that which can be destroyed by the truth should be" is false, or you've written dangerous falsehoods which would overtax the rationality of our readers. Eliezer's response above seems to imply the former.
Did you read the "riddle theory" link? The riddle is not dangerous because it's false, but because it's incomprehensible.
And of course, if you meant to list all the possibilities, you left out the ones where E. is just wrong about the danger.
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.