The whole idea of throwing the Ring into the fires of Mt. Doom was to destroy it completely, and put it out of the reach of Sauron forever. Only in the place that it was made, by the same forces that made it, could the Ring be destroyed. It was too powerful to be destroyed by throwing it into a little campfire or forge.
As long as people have rulers, a thirst for power will always exist. It is in human nature to want to be the best, and to order everyone around. Some people do a very good job of suppressing that, and some do not. Unless you turn Middle-earth into a total anarchy, you will never get rid of the thirst for power. Another possiblity is that Morgoth could have affected Arda in an indelible way. In Morgoth's Ring, it is said that to completely destroy Morgoth and all his power, all of Arda would have to be destroyed. Arda is, in a sense, Morgoth's "Ring." Since he constantly warred with the Valar during its making, and "cast his shadow" over many of the creatures and races that populated it, Arda would never be completely free of his influence. Only at the End of Days, in the Dagor Dagorath, when Morgoth will be overthrown and Arda remade, will his power truly be destroyed.
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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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