Disillusionment gets a bad rap

Why does the word disillusioned have negative connotations? It means "not enchanted, disappointed." Disappointment is certainly unpleasant, but if it arises from learning the truth, then its root is a person's unrealistically high expectations. A disillusioned person is freed from illusion, they're seeing things as they truly are. The knowledge of that truth is more valuable than whatever false comfort is gained by clinging to unrealistic illusions. I mean, let's just face the truth: He-Man was a terrible TV show.