https://www.crimemuseum.org/crime-library/serial-killers/serials-killers-vs-mass-murderers/
"...A serial killer is conventionally defined as a person who murders three or more people in a period of over a month, with “cooling down” time between murders. For a serial killer, the murders must be separate events, which are most often driven by a psychological thrill or pleasure. Serial killers often lack empathy and guilt, and most often become egocentric individuals; these characteristics classify certain serial killers as psychopaths. Serial killers often employ a “mask of sanity” to hide their true psychopathic tendencies and appear normal, even charming. The most notable example of a charming serial killer is Ted Bundy, who would fake an injury to appear harmless to his victims. Ted Bundy is classified as an organized serial killer; he methodically planned out his murder and generally stalked his victim for several weeks before committing the crime. He committed an estimated thirty murders from 1974-1978 before his eventual capture. Serial killers such as Ted Bundy are known to be organized and psychologically motivated to commit murder, which separates them from mass murderers who appear to kill randomly at one time.
SERIAL KILLERS VS. MASS MURDERERS
Mass murderers kill many people, typically at the same time in a single location. With some exceptions, many mass murders end with the death of the perpetrators, either by self-infliction or by law enforcement. According to Dr. Michael Stone, professor of psychiatry at Columbia, mass murderers are generally dissatisfied people, and have poor social skills and few friends. Generally, the motives of mass murderers are less obvious than those of serial killers. According to Stone, 96.5% of mass murderers are male, and most of them are not clinically psychotic. Rather than being a psychopath like most serial killers, mass murderers tend to be paranoid individuals with acute behavioral or social disorders. Like serial killers, mass murderers also display psychopathic tendencies, such as being cruel, manipulative, and uncompassionate. However, most mass murderers are social misfits or loners who triggered by some uncontrollable event.
Serial killers and mass murderers often display the same characteristics of manipulation and lack of empathy. What differentiates the two is the timing and numbers of the murders. Serial killers commit murder over a long period of time, and often in different places, while mass murderers kill within a single location and time-frame."
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