In 2005, following the public outrage over the abuse of prisoners at Abu Ghraib prison in Iraq, the research group Gallup organized a survey to gauge Americans’ attitudes towards the “enhanced interrogation techniques” employed by intelligence services in the War on Terror. When presented with descriptions of such methods, including waterboarding, mock executions, religious violation, and the threat of attack dogs, the overwhelming majority of those polled rejected them as morally impermissible torture. But a single practice, sleep deprivation, was deemed acceptable by half of all respondents on the basis that it doesn’t constitute torture, per se, but “psychological persuasion.”…