The UnXplained: Season 2, Episode 15

2 - 15: Serial Killers

The total disregard for life exhibited by serial killers shocks our sense of humanity and makes us question our safety and security. These sadistic psychopaths rarely show any remorse or empathy for the lives they've destroyed. How could human beings be capable of these horrific atrocities? And what causes such a murderous defect in the human psyche?