Icy Stairs vs. Hannibal Lecter

We just started watching another crime show about a serial killer (True Detectives) and this made me wonder how often serial killing actually occurs-- because if you watch Luther and The Fall and Dexter and Hannibal and The Following (I've only seen the first two on the list-- and that's enough serial killing for me) then you'd think that the world is absolutely overrun with psychopathic homicidal maniacs . . . but it turns out (according to Scientific American) that only one percent of the 15, 000 murders that occur in the U.S. each year are the work of serial killers, and the FBI estimates that there are 25-50 serial killers operating at any particular time . . . which is actually more than I thought, but you should still worry more about getting the ice off your porch steps then the chance that your neighbor has a bunch of frozen heads in the freezer.