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			Tolkien addressed this at length in some of the essays published in Morgoth's Ring, especially the one titled "Melkor Morgoth."  When I have time I'll type some relevant excerpts.
 For now suffice it to say that Morgoth and Sauron had somewhat different motivations and objectives.
 
				__________________The entire plot of The Lord of the Rings could be said to turn on what Sauron didn’t know, and when he didn’t know it.
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