All of us "prepare a face to meet the faces that we meet" as TS Eliot put it, the disordered just do it more extremely. At least half are physically or sexually abused as children, and use alternative personae as a way of escaping from an unbearable present. Jackson described the physical and mental cruelty of his father in detail and although he has denied it and no mention was made of it in the film, Jackson's cousin claims he was also sexually abused, by a relative.