From irritating videography and directors who appear to get off on the pain suffered by the victims of the crimes, to outright LIES from psychologists who are way out of step with modern science... this series is NOT worth your time. For example, unnecessary displays of women bleeding and suffering presented in a way that looks like the directors/editors were sexually excited by seeing their gasping and writhing in a bloody mess on the floor was VERY offensive. Worse than the sexualization of the victims was the fact that we know specifics of the causes of psychopathy. Newsflash! It is NOT video game playing and exposure to porn - unlike the well debunked claims of the psychologists. Psychopathy is measured by the Psychopathy Scale (which is not even mentioned by the "psychologists" in the series). There are many disorders associated with being high on the psychopathy scale, and there is not any real debate anymore as to the causes - the "nature vs nurture" question, for example. EVERYONE who is high on the psychopathy scale is EVIL, no matter if they ever commit any crimes or not. Most of the time, such mentally ill folks are functioning members of society who never murder anyone... but they do in fact hurt people in many horrible ways. From Malignant Narcissistic Personality Disorder to Antisocial Personality Disorder, ALL of those monsters are pure evil to their core. As for the factor of childhood abuse, that is only a factor where it comes to making people worse when they are already born high on the Psychopathy Scale. An MRI and the Hare Psychopathy Checklist are excellent tools to see who is high on the Psychopathy Scale. For example, if a person is evil, then it will show on an MRI as the prefrontal cortex having the region for processing emotional empathy turned "off". You can literally see these monsters via an MRI. It does NOT matter if they engage in serial killing, the evil is still there... and toxic to everyone who has the misfortune of coming into contact with them. The series failed to cover any of those VERY important points and really appeared to focus on providing sexual excitement for psychopaths who might be watching the show. They also appeared to take pains not to offend that target audience. It is for those reasons that I gave this series a strong "Dislike"!