I don't get the fascination with them. Then again look at all the wackos the U.S. has had over the years. Mary Kay, Andrea Yates, that teenager in long island (Amy Fisher) who had an affair with some guy then shot his wife in the face back in the eighties. BTK and everyone's favourite cannibal Jeffrey Dahmer. Then there was Ted Bundy, Timothy McViegh, Eric Rudolph (who is considered a martyr in some social conservative circles), Son of Sam, Bonnie and Clyde... List goes on and on.
America loves pyschos.