Reasons
In some societies, especially tribal societies, cannibalism is a cultural norm. Consumption of a person from within the same community is called endocannibalism; ritual cannibalism of the recently deceased can be part of the grieving process, or a way of guiding the souls of the dead into the bodies of living descendants. Exocannibalism is the consumption of a person from outside the community, usually as a celebration of victory against a rival tribe. Both types of cannibalism can also be fueled by the belief that eating a person's flesh or internal organs will endow the cannibal with some of the characteristics of the deceased.
In most parts of the world, cannibalism is not a societal norm, but is sometimes resorted to in situations of extreme necessity. The survivors of the shipwrecks of the Essex and Méduse in the 19th century are said to have engaged in cannibalism, as are the members of Franklin's lost expedition and the Donner Party. Such cases generally involve necro-cannibalism (eating the corpse of someone who is already dead) as opposed to homicidal cannibalism (killing someone for food). In English law, the latter is always considered a crime, even in the most trying circumstances. The case of R v Dudley and Stephens, in which two men were found guilty of murder for killing and eating a cabin boy while adrift at sea in a lifeboat, set the precedent that necessity is no defence to a charge of murder.
There are numerous examples of murderers consuming their victims, often deriving some degree of sexual satisfaction from the act of cannibalism. Notable examples include Albert Fish, Issei Sagawa and Jeffrey Dahmer. These individuals are usually considered to be mentally ill, although the compulsion to eat human flesh is not formally listed as a mental disorder in the Diagnostic and Statistical Manual of Mental Disorders (DSM). Cases of autophagia, or self-cannibalism, have also been reported.
Read more about this topic: Cannibalism
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