Aranel already explained this above I believe...
Quote:
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The dwarves were hard to govern and bend to Sauron's will, but Men took them and willingly did everything he wanted them to do because of their lust for power...
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Dwarves are not Men, and Men are not Dwarves. Dwarves are not so easily controlled, and they desired Gold and other Rocky Rocks while Men desired power. So Men were ensared easily while the Dwarves were not.