There are a number of consequentialist arguments against interrogational torture. Here is a link to a good article on them (subscription required). The most prominent is that it is a waste of time and resources, as no actionable information is gained. Another one is the institutionalization argument: setting up a torture program requires professionalization, which means recruitment, training, and evaluation. Historical investigation of torture programs (South America in the 1970s and 80s, the French in Algeria, and so on), show that such a torture infrastructure cannot be contained to a small portion of the security apparatus, but spreads throughout the military and into civilian law enforcement. The harm caused by such a torture infrastructure spreads due to the alcoholism, depression, and domestic violence spread by the torturers when they go off-duty. And the suicide of those close to the torture structure, as in the article linked in this post.
Given that deontological arguments against US torture practices don't reach a sizable percentage of the American population (see this exchange of letters for an example), I'd say this creates a demand on those deontologically committed to an anti-torture campaign to engage consequentialist arguments, like the above, since they may be effective on people for whom the deontological arguments are ineffective.
In other words, for a deontological argument to work, the party to whom it's addressed has to share the commitment to respect for the humanity of those subjected to torture. When that respect is lacking, the arguments fall on deaf ears. So if it's your duty to fight torture, then that duty compels you to use arguments that work. And for a portion of the American population, consequentialist arguments based on the harm torture does to Americans hurt by those corrupted by the practice of torture and the spread of that harm attendant to its necessary institutionalization, are more effective than deontological arguments.
Updated 17 Sept 2010, 2:25 pm: Excellent post here on the topic by Leigh Johnson (Dr. J. in comments below). Update 2: A series of posts on torture by Johnson is available here.
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