I think that the main reason that Pippin said that was to make the character seem smart. In the Fellowship of the Ring, he was made up to be a slightly foolish, comical, immature little Hobbit. Now, he is sort of "coming into" his intelligence. He is truly realizing how big the mess that they're in is. After Merry told him that "there might not be a Shire to return to," Pippin realized that they had to DO something. And little Pippin went ahead and DID something, he persuaded Treebeard to turn around, and eventually, caused the destruction of Isengard.
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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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