I can't say I always find that to be true for myself. There are truths that I wish weren't true, and when I find that I was merely being overly pessimistic, that's usually a good thing. Even though I want my beliefs to reflect reality, that doesn't stop me from sometimes wishing certain beliefs I have weren't true, even if I still think that they are. It's possible that being wrong can be a good thing in and of itself, completely separate from it being good to find out that you're wrong, if you're wrong.