Lust, anger, greed and a host of other kleshas (obstructions to spiritual progress-also dosha) fulfill Satan's mission to keep spiritual souls bound to the wheel of karma (samsara), commonly called 'damnation', to reincarnate indefinitely.
The moment the soul wakes up to his spiritual destiny Satan becomes alarmed, he might lose one to the almighty and finally lose ALL to the almighty, then what use would there be for him? And so the cosmic drama continues and man is slammed against the hard rocks of ignorance and duality until he obeys natural law and cooperates with the Divine Plan and realizes his oneness with God. Civilizations that fell due to their violation of natural law: http://en.wikipedia.org/wiki/Atlantis
