The agents of atrocities have a self-interest in keeping their acts invisible, buried, and publicly forgotten. The Nazis meant to plough under every death camp, and Himmler once consoled his SS cohorts that, while the German public would never know the full scope of their service to racial cleansing of the nation, they should always take pride in their work. In South African torture cells, the torturers taunted their victims with the prediction that, just as no one could hear their present screams, no one would remember them in the future either. The moral damages of amnesia are multiple: to victims, whose final indignity in survival or in death is to have their suffering forgotten; to perpetrators, whose moral health cannot be restored without confrontation of their immorality; and — not least — to a public that has every prudent self-interest in knowing enough about an evil past to be put on alert against its repetition.