When democratic governments consider the option of torturing someone, the stakes are usually high. They won’t consider it just for some marginal benefit. The paradigmatic case is the ticking time bomb that’s about to kill thousands or even millions. Torture is supposed to be justified because the benefits are huge, or – stated negatively – because the possible harm resulting from a failure to torture is huge. Combining the size of what is at stake with the urgency of the threat makes the case for torture even stronger.
However, this justification of torture has some unsettling side effects. Given the urgency, and given the fact that terrorists are probably trained to withstand torture, a free society would have to
maintain a professional class of torturers, and to equip them with continuously-updated torture techniques and equipment. Grave dangers to democracy and to individual freedoms would be posed by an institutionalized professional “torture squad”. (source)
Such a highly trained and continuously available torture squad would be necessary to inflict torture that is likely to succeed in extracting the information on a reliable basis and within an extremely short time frame. It would also be necessary to inflict levels of pain sufficient to procure the victim’s compliance but insufficient to kill or render incapable of communication. Amateur thugs will not suffice. You really need professionals.
This is the institutionalization of torture. It’s difficult to see how a free society could survive the presence of such a torture squad. It would infect our entire society to know that there are people among us who torture for a living. The squad members themselves will most likely fail to remain well-intentioned, and the mere existence of such a squad corrupts morality in a society. It’s naive to think that the members of the torture squad will return to normality once their job is done and function like normal law-abiding and non-violent citizens in between emergency sessions. Torture leads to the destruction of a democracy and a free society that decides to go this way.