My reign of terror was legendary. Dozens of children would fall by my blades.
~ Words from the story of Freddy Krueger (as told by Freddy himself) about how many children he murdered in the town of Springwood.
Child Murderers (also referred to as Child Killers) is a trope on villains who kill, or at least attempt to kill a child, baby or, to some extent, teenagers. These villains are considered to be some of the most evil villains.
Why these characters are truly disturbing?
Kill a child or a baby, is the worst crime that a villain could made, because that goes against is the principles of humanity, Many of this "Humans" have no regards of kill them, because children and babies are defenseless and they are the most easiest victims than full grown adults.
Even worse, many of this characters are Pedophiles or Ebebophiles who had no positive qualities, Is intersting to note that. This characters qualify as Master of Horrors and Complete Monsters, for the said reason mentionated before.