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It's likely since he was already a thief before the Ring was ever found. Gollum was already corrupt. The others who fell to the temptation of the Ring, lusting after it, were Saruman, Denethor, and Boromir (were there others?); it may be argued that whereas they had moral weaknesses, they had not yet, when they discovered that the Ring existed, committed any deeds of moral failure.
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