By Theodore Dalrymple Even murderers in prison have a moral hierarchy, the lowest of their low being the killers of children for sexual purposes. Ian Huntley killed two ten-year-old girls for such purposes in the small town of Soham in Cambridgeshire in 2002. He had been suspected by the police of many sexual attacks on women and young girls in a different area of the country when he was appointed school caretaker in Soham, and later (while in p…