"Psssst, Don't Tell Anyone But the CIA's Enhanced Interrogation Techniques Worked"
Commentary and background links here.
Obviously, there is still a principled argument to be made that the nation should not engage in such practices. But the burden of making it in a principled way should be to say: "While this is an excruciating choice, it would be better for thousands of Americans to be killed than to allow the CIA to use non-lethal coercive tactics (that cause no lasting physical or mental damage) on a terrorist who refuses to tell us what he knows about ongoing mass-murder plots."