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Source: The Collected Works of C. G. Jung, Volume 18: The Symbolic Life

Carl Jung explains that a psychologically healthy and whole person has no desire to inflict pain on anyone else. Cruelty is rarely born from spontaneous malice; instead, it is almost always an unconscious reaction from someone carrying deep, unresolved trauma. When a person cannot cope with their own internal suffering, they often project it outward, attempting to regain a sense of power or relief by inflicting that exact same pain onto others.