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One final note here: you’ve probably noticed that whenever I mention serial killers, I always refer to them as “he.” This isn’t just a matter of form or syntactical convenience. For reasons we only partially understand, virtually all multiple killers are male. There’s been a lot of research and speculation into it. Part of it is probably as simple as the fact that people with higher levels of testosterone (i.e., men) tend to be more aggressive than people with lower levels (i.e., women). On a psychological level, our research seems to show that while men from abusive backgrounds often come out of the experience hostile and abusive to others, women from similar backgrounds tend to direct the rage and abusiveness inward and punish themselves rather than others. While a man might kill, hurt, or rape others as a way of dealing with his rage, a woman is more likely to channel it into something that would hurt primarily herself, such as drug or alcohol abuse, prostitution, or suicide attempts. I can’t think of a single case of a woman acting out a sexualized murder on her own. The one exception to this generality, the one place we do occasionally see women involved in multiple murders, is in a hospital or nursing home situation. A woman is unlikely to kill repeatedly with a gun or knife. It does happen with something “clean” like drugs. These often fall into the category of either “mercy homicide,” in which the killer believes he or she is relieving great suffering, or the “hero homicide,” in which the death is the unintentional result of causing the victim distress so he can be revived by the offender, who is then declared a hero. And, of course, we’ve all been horrified by the cases of mothers, such as the highly publicized Susan Smith case in South Carolina, killing their own children. There is generally a particular set of motivations for this most unnatural of all crimes, which we’ll get into later on. But for the most part, the profile of the serial killer or repeat violent offender begins with “male.” Without that designation, my colleagues and I would all be happily out of a job.
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John E. Douglas (Journey Into Darkness (Mindhunter #2))