For Ted Bundy, his fascination with killing girls with long black hair parted in the middle came from rejection. In college, he was genuinely in love with a girl with these physical characteristics, but she rejected him. It wasn't the cause of his serial killing tendencies, but it was the reason he chose his victims. All serial killers are psychopaths and don't feel real emotions. Most had traumatic childhoods that led them to start killing. Shirley Scott compares serial killers to black holes. They have a hole inside of them that needs to be filled, and they fill that void by killing. Most people don't understand what drives someone to kill, how they feel no pity towards their victims. It's a subject that repels us, but which fascinates and intrigues us at the same time..