Over the course of the past century, violent crimes and murderers have become more common in society due to the exposure received from media and the increase in public violence. Acts of vengeance are often linked to an individual's desire to reduce or relieve their stress. The offenders of these crimes are often said to initiate their own pleasure from the sufferance of others. Within the past century, the number of documented serial killers - individuals who murder predatorily in distinct patterns or often - has been on the rise; however, many of these attackers have certain mental and psychological problems that could help police in understanding, identifying, tracking, and capturing these predators or even preventing them from striking.
             According to professional profilers, the average serial killer is usually a white male from a lower to middle class background, and is aged in his twenties or thirties. Many were abused by parents or were adopted. As a child, the typical serial killer often set fires, tortured animals and wet their beds. These behavioural traits are referred to as the triad of symptoms. Brain injuries are common among killers. Most are extremely intelligent and are fascinated with the police and authority in general. Some serial killers at one time have attempted to become police officers, but were rejected, or worked as security guards, or have served as a member of the armed forces or military. In several cases, the killer may even impersonate themselves as members of law enforcement to gain access to their victims.
             Serial killers primarily target individuals that are weaker than them to be their victims. This may explain how and why serial killers decide who to attack and why
             women are easier prey to them than men. Victims will often embody a certain stereotype, which contains a special motivation, meaning, or desire for the killer. Serial killers typically humiliate their victims and make at...