why do serial killers kill

Serial killers kill for a variety of complex reasons related to their psychological makeup, upbringing, and motives, which can include a mix of genetic, environmental, and emotional factors. Common themes involve early exposure to physical abuse, drug abuse, alcoholism, brain injuries, and mental disorders; these often create a foundation that triggers homicidal behavior when combined with certain genetic predispositions. Their motives to kill tend to fall into categories such as visionary (driven by psychosis or hallucinations), mission-oriented (aiming to "rid the world" of certain groups), hedonistic (seeking thrill or pleasure), and power or control (exercising dominance over victims). Many serial killers have histories of childhood abuse or trauma, which may lead them to experience violent fantasies that they then attempt to realize through murder. Serial killers often seek control or to alleviate intense psychological pain, with the act of killing providing temporary relief or affirmation of their sense of self-worth. Unlike common homicides motivated by anger or revenge, serial killers often kill strangers driven by impulses, desires, or distorted perceptions of reality. Their killings can also fulfill sexual desires or other deviant fantasies. In summary, serial killing arises from a confluence of early adverse experiences, biological and psychological factors, and specific motives such as the need for control, thrill, or fulfilling fantasies, making them fundamentally different from other types of murderers.