" The concept of “evil,” though less metaphysically primitive than, say, “demons,” doesn’t fit easily into a modern scientific worldview. Still, people seem to find it useful, and the reason is that it is metaphorically apt. There is indeed a force devoted to enticing us into various pleasures that are (or once were) in our genetic interests but do not bring long-term happiness to us and may bring great suffering to others. You could call that force the ghost of natural selection. More concretely, you could call it our genes (some of our genes, at least). "

― Robert Wright , The Moral Animal: Why We Are the Way We Are - The New Science of Evolutionary Psychology