The one thing that led to Sauron's downfall was that in his overweening pride, he thought that all his enemies thought exactly like him, and so, tried to counter their moves based on what he thought they would do. Sauron would never have given up the chance to wield the One Ring, and he thought the same thing applied to Aragorn. He would never have imagined that the whole Heir-of-Isildur-has-returned ploy was just being used to distract him from Frodo and Sam, deep inside Mordor. That is what ultimately got him.
He used the same mode of thinking when dealing with all of his enemies. That was why Gandalf's ruse worked as long as it did. Sauron just didn't comprehend the power of "good," just as Manwë just didn't comprehend evil. He thought all people thought and behaved exactly like him, and that was what he expected Gandalf (and Aragorn) to do.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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