According to the FBI

According to the FBI, a serial killer is someone who commits at least three murders over more than a month with an emotional cooling off period but the real distinction between homicidal murders and serial killings are the motives. Murders usually involve a killer having specific personal issues with the victim and act out due to disputes like family affairs, fights with lovers or even gang violence. Serial killers are usually always strangers to their victims and they are solely driven by their desire to kill. There are many theories as to why people become serial killers and almost all of them involve the argument of nature vs nurture. This questions whether serial killers are born with a motive to kill, or did they learn or develop it over time through their surroundings and conditions. The nurture theory explains that serial killers are created through traumatic childhood experiences like child neglect, molestation, or physical and mental abuse. After years of research on serial killers, psychologist have collected valuable information to help us understand why they feel the need to commit these horrific crimes.
The nature theory looks for a distinct difference in the brain of a serial killer compared to a normal person.

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