Evil also originates from disobedience. Lucifer was disobedient and desired power. For this reason he was banished. In the same way Melkor was disobedient and did not sing in the way he was commanded. He created discord in the song of the ainur, and the things he corrupted were also disobedient by association. To stay reasonably on topic, Smeagol liked to burrow to the deep places and discover things that were hidden, i.e. he was curious. He may not have been bad originally, but was corrupted by the evil influence of the ring, which drove him to murder, and the rest became history.
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-Halbarad to Aragorn, 'The Passing of the Grey Company' Book V, Return of the King."A little people, but of great worth are the Shire-folk. Little do they know of our long labour for the safekeeping of their borders, and yet I grudge it not"
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