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"Reality was there all along." The fact that someone believes something is part of reality, and if it changes, then reality is changing. There is no reason that this cannot take away some joy from someone, even if their beliefs end up less accurate.
As St. Paul said, "For in passing judgment on another you condemn yourself, because you, the judge, practice the very same things." Asserting that conforming your beliefs to reality cannot make you less joyful is itself a form of wishful thinking in which you refuse to conform your beliefs to reality.
If I correctly read what you're saying, you're basically asserting that you can be sad because your belief structure has changed. That implies to have meta-beliefs, which are extremely dangerous from a rationality point of view.
As a rationalist, you should keep your identity very small and do not presuppose anything about the general structure of how your beliefs should be like, because you will be almost certainly wrong (and disappointed).
Consider this extreme example.
On the other hand, I don't understand the Paul quote: we're exactly saying that you shou... (read more)