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Mythology and folklore are really an early form of psychology. In a pre-scientific era - it was the only means by which average people could anchor their frustration and warnings to others regarding the Consciousness Parasites and other pathological predators within the material world - without having to rely exclusively on supernatural-religious concepts such as demons, succubi and so on. This was probably to avoid charges of witchcraft and blasphemy. So rather than deal with purely religious motifs - from around the Middle Ages on - the psychopath entered into the world of children's fairy tale.
Just about all European fairy tales from this period on are about psychopaths and psychopathic behaviour. How to recognise their traits, and deal with them. This is not by accident - a collective folk memory was generated in the guise of children's stories of wicked stepmothers, wolves disguised as kindly and familiar people turning out to be killers. This repository of pathological awareness was essentially the only option available to a mainly illiterate population of the time. A powerful method to warn others in such a way that would be passed on and without risking ridicule and censure - by application of a linguistic folk art to develop changes in the collective consciousness. Ultimately, this is what these fairy tales were attempting to achieve going forward - a warning of sorts. While also serving the function of an allegorical collective therapy session to heal past trauma within a community caused by psychopaths in the past.
Comment: For more on the benefits of laughter see: The Health & Wellness Show: Don't Panic, Lighten Up!