I like the way steven0461 put it:
...promoting less than maximally accurate beliefs is an act of sabotage. Don’t do it to anyone unless you’d also slash their tires, because they’re Nazis or whatever. Specifically, don’t do it to yourself.
I think I agree with both khafra and Nick.
I like this quote, and I've used it before in conversations with other people.
It has been claimed on this site that the fundamental question of rationality is "What do you believe, and why do you believe it?".
A good question it is, but I claim there is another of equal importance. I ask you, Less Wrong...
What are you doing?
And why are you doing it?