On the subject of Evil, I'm not sure this is a healthy way to deal with the situation. I think it aids people in distancing themselves from someone (like Dahmer) by saying "It's EVIL!". The fact is that he was a man. He had problems, serious ones, but none the less... he was a human being that fell apart at some point. Trying to recategorize him into something "mythic" to me kind of hurts the cause. It alleviates us as a society from trying to correct problems.
I appreciate Nick's concern, and if I were doing what he cautions against, I would be concerned as well. However, I think he has misunderstood the way I am using "evil" - perhaps I wasn't being very clear in my original post. In my understanding, "evil" is not some mythic category removed from the context of human nature. I don't view Dahmer, or Cho, as somehow less than human, ontologically, when I talk about them and their actions as being evil. When I look at someone who has done something evil, it is in full view of their humanity.
As a technical definition, evil is a privation, the absence of good, and not a thing in itself (taking a cue from Augustine) - in other words, that which deviates from the character of the God who is good. You'll recall that I spoke of "the core of evil in each of us"; I think that the pull, the desire to rebel against God's goodness is a part of each person's nature, yours and mine and Cho's, as broken image-bearers of our Creator. These men have done nothing that I myself, absent certain conditions, am not capable of doing. Evil, to me, is not an abstract; it is wound tightly around each individual's human nature. So I do not in any way lose sight of the fact that these are men (in the gender generic sense) doing these thing, nor do I endorse any view that would lead to this kind of distancing or a shirking of societal responsibilities.
As a side note, perhaps another difference at play here is one that I'm only inferring from what Nick wrote, so I can't be sure this is his actual position (please correct me, Nick, if I am wrong!). It seems to me that Nick is operating from the view of human nature similar to that made famous by Rousseau - that man is basically good and is only later corrupted by outside forces - whereas I see the seeds of man's corruption as being internal, pervasive, and present from the moment the individual becomes an individual. I may be wrong in attributing this to Nick, but it is an interesting subject that maybe I'll post on separately sometime later.