Why do I find a serial killer attractive?

I'm facinated by some of them and very interested to hear what they have to say and how their minds work. But, what I find sickening is that I find myself....wow he's really good looking. Jeffrey Dahmer was such a doll. Ed Kemper, Ted Bundy, Richard Ramirez. There are several of them that I find attractive. Does anyone else do this? What is wrong with me? Why would I think someone that has caused so much pain and death is attractive in anyway at all???