Smiley Face Killers

Anyone believe in the theory?  I have always been fascinated with serial killers and the drive behind the madness (maybe its just because Wisconsin is known for them).  I think they lose that sense of control that makes us human.  People get urges to do some pretty sick and twisted things, but have morality (or for some, fear of consequences) take over and keep them from acting out.  What makes this scary is the fact that it could be a rather large group.  Here's a link if you don't know what I'm talking about.

http://www.msnbc.msn.com/id/24366804/