You would put instrumental rationality above epistemic rationality?
So if it makes me happy to believe the Moon is made of cheese, I ought to do so?
If making yourself happy is, all things considered, what you want to do. (And then assuming that said belief modification is the most effective way to gain happiness.)
If making yourself happy is, all things considered, what you want to do. (And then assuming that said belief modification is the most effective way to gain happiness.)