I'm still flabbergasted by the massacre at Virginia Tech. There's such an obvious pattern: the angry young man; the coldness of his appearance and actions during the massacre; the narcissistic lack of any kind of compassion for the victims; the determination to drive the body count as high as possible; the suicide that ended the massacre and denied any of the closure that might come from an explanation of the inexplicable.
Hannah Arendt wrote convincingly of the banality of evil, of how evil is not some sort of "out there" anomaly, but within most of us in some measure. In societies where people do not respect the rule of law and the rights of each other, this evil surfaces. In Nazi Germany, as Arendt points out, there was no shortage of banal, evil people to work for the Gestapo, run the concentration camps, to handle the loot stolen from the Jews, and to exploit and terrorize the occupied countries.
As of early Tuesday, there were no details about the Virginia Tech killer, but, if the pattern holds, he was young. He was angry, but not overtly so, and didn't draw much attention to himself. In short, he was relatively "normal". And, since there have been been about 100 "school shootings" in modern history, he has become "normal", or, at least, typical of the kind of man who does this kind of thing.