This piece posted at Another Think is brilliantly written. Below I've pulled just a small quote, but it is definitely worth seven or eight minutes, if you have them, to wrap your brain around this guy's thoughts.
Evil lusts after death and delights in wickedness. It is emotionally untouched by the most sickening acts of cruelty. Evil, in the Christian view, is a way of thinking and behaving that is the antithesis of all that is good and just and pure. Evil is anti-God, anti-Christ, anti-love.
Most secular modernists are decent people. They have rejected God, but that is not to say that they don't attempt to live decent and moral lives. They walk in the garden of earthly delights and breathe deeply, enjoying the fragrance of lilies on the breeze as much as anyone. They would rather not believe in the existence of a Gardener because of all that it would mean in the nitty-gritty realities of their lives. But they nevertheless enjoy the scents of life and benefit from the unseen handiwork of God in the world.
A few, like Cho Seung-Hui, are repulsed by the fragrance of God's garden. They seal themselves inside a plastic bubble and spend their lives sucking in the stench of their own fetid breath. Instead of laughter and music, they only hear the ravings of their inner rage.
The New Testament tells of a man, or men, possessed by many demons. These men were thoroughly mad and isolated from normal society.
Read th whole article here: AnotherThink: Uncomfortable with Evil
HT: thanks, Mark Daniels, for pointing this out.