I, for one, do not care one whit whether "walling"—it's okay, they were flexible, fake walls that the questioned were being whipped into— and "waterboarding"—it's okay because we didn't really drown them—of detainees in secret prisons and black sites, etc., did or did not provide us with useful information. That is, I don't care whether Cheney or Obama is right about the effectiveness of such treatment, i.e., torture. It might very well be the case that we could get very good information out of all sorts of suspects if, for instance, we raped and tortured their families in front of them and then mutilated and murdered those families, but that wouldn't make it the right thing to do.
Why? Because there are things that are wrong, no matter what good consequence they may provide—side note: it is very funny that some of the same people who think torture is justified because it might provide good information (ends justifying means), think the use of destined-to-be-discarded embryos is morally repugnant no matter what medical breakthroughs might be possible (ends not justifying means).
There are certain actions that are beneath a civilized person, a civilized nation, a human being. There are certain things that make those who engage in them beasts. There are worse fates than the loss of life.