If the series is based on the writer's friend who felt the desire to kill, then it could be he wants you to feel that, by presenting obvious people who normal people would want dead, then upping the ante to an immoral act of premeditated murder for someone who is innocent, but appears the same as the others.
Not necessarily something as over the top as Venom the Lethal Protector or Punisher running around with a machine gun. If he's careful, the writer can show an interesting story.