Disturbing footage of a psychopathic child cut from the 1990 documentary Child of Rage. Technically, the child is not officially a psychopath. She shows psychopathic tendencies, but this is due to her mistreatment at the hands of her parents. She actually suffers from an attachment disorder - a disorder that comes about when children such as Beth face abuse early in life.
After therapy and a great deal of love, she is now a perfectly healthy adult that works tirelessly to help others.
For those who want to learn more about the importance of love in a child's early years, I suggest that you take a look at Harlow's monkey experiments. Very similar.