Another thing that makes Sam totally unique from Gollum, Bilbo and Frodo is that he is the only one that 'inherits' the ring knowing full well what it is. He also has the advantage of seeing what the corruption had done to Gollum and what it is doing to Frodo. The three (Gollum Bilbo Frodo), never saw the corruption or at least recognized it for what it was.
Because of his strong character and advantages of seeing what the power of the ring can do, I feel that Sam is the only one who could have given up the ring so easily. If he couldn't, then no one could and there would be no hope.
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Just because a person has the right to do something doesn't make it the right thing to do.
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