This post does not seem to contribute much. As nawitus pointed out, this post does a good enough job of distinguishing between instrumental and epistemic rationality.

While it seems obvious that in some cases, a false belief will have greater utility than a true one (I can set up a contrived example if you need one), it's a devil's bargain. Once you've infected yourself with a belief that cannot respond to evidence, you will (most likely) end up getting the wrong answer on Very Important Problems.

And if you've already had your awakening as a rationalist, I'd like to think it would be impossible to make yourself honestly believe something that you know to be false.