That’s kind of a red herring. Most actual killings don’t come from serial killers. They are one-off, two-off.
It is no more of a red herring than your conclusions about southerners and rednecks. I lived the majority of my life in the northeast and about a third of my life in the south. While the south has its problems, the urban centers in the north are far more dangerous and amoral than in the south.