Movies or book, it's quite simple. If Aragorn had not gone west, there would have been no Paths of the Dead. No army to defeat the Corsairs of Umbar, and another host of enemies sailing up the Anduin rather than slimy green salvation. If Aragorn had gone with Frodo, Minas Tirith would have been lost.
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But Gwindor answered: 'The doom lies in yourself, not in your name'.
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