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Both sides of the debate have missed the point. Torture is a form of violence, whether it "works" or not. Violence has ugly, hurtful, and unintended immoral consequences. Always. Unavoidable. Violence spawns violence. It is the breeding ground of hatred and revenge. For those naive souls who believe that in this case "the ends justify the means," it seems not to sink in that the ends and the means are the same thing. When we practice the violence of torture, we become the violence we practice. In some rare instances, perhaps, we do have to "fight fire with fire," but the usual way of putting out fire is with its opposite, a fire retardant. In 999+ out of a thousand cases, the only antidote for violence is its opposite, peace.
No sane, moral person tortures another person. The consequences to the human spirit are beyond bearing for the both the person being tortured and the one doing the torture. It requires insanity and a lack of morality to torture—the kind of insanity and immorality spawned by violence.