Yossi Mandel at 2012-12-13 12:15:59:
From the Jewish perspective, there is another strand: That evil is only due to our limited perspective below. From the perspective above, what we see as evil is good for us somehow, in the long range, etc.
This is expressed in various ways: "This, too, is for good." "All that the merciful one does is for good."
Another thought that springs from this is that Satan will be punished when what we perceive as evil is abolished - not for acting against the Almighty's will, but for having done too good a job of temptation.
In reference to our work, it brings to mind that the villain must have their own worldview, their reason for what they are doing which makes perfect sense to them - ala Hannibal Lecter pursuing the cannibalistic death of his sister in a twisted form. Just as faith and doubt are two sides of a coin, hero and villain are best when they are two sides of a coin. If we pursue the symbolism (non-intentional, surely) of Raiders of the Lost Ark, the villain is only one side of the coin, but the hero is both - not one, not the other, but both.
I'm sure greater minds will see more from this perspective.