Some comprehension came as a more detailed picture of Eric Harris — if not Dylan Klebold — began to emerge. The image of Harris is at once disturbing and disturbingly reassuring. Just 18, Harris was not a racist or a goth or a fascist, although he dabbled in all those obsessions. In fact, it appears, Harris was a psychopath, who advertised his dark side nearly everywhere he went. For all his advertising it, though, Harris somehow attracted little attention until he had transformed himself into a hideous killer. The signs were hard to miss. Harris was taking Luvox, an antidepressant similar to Prozac that's often prescribed for depression and obsessive-compulsive disorder. Based on what's known about him — in particular the writings on his Internet Web page — some psychologists believe Harris may have suffered from a particular type of antisocial disorder known as "malignant narcissism." The traits are frightening: Self-absorption and an inability to empathize with others' pain. Messianic self-perception. A quest for revenge. A need for enemies as justification for extreme aggression. Aubrey Immelman, a psychology professor at St. John's University in Minnesota, says narcissistic leaders often surround themselves with uncritical admirers "willing to do their bidding at almost any expense." Perhaps that's where Dylan Klebold came in.