Because they rise to the bait of the torture lovers who try to frame the debate as one of effectiveness. Further, it's quite useful to undercut the torture lovers arguments by point out that, infact, it's utterly ineffective.
But that's not the point. Torture is morally and ethically wrong. Simple as.
Since when has the U.S. been constrained by morals and ethics in fighting their enemies? If you believe that the three detainees waterboarded by the CIA is the worst breech of U.S. morals and ethics in the last 70 years then you live in a cloistered world.
"In a previously undisclosed private memo, President Obama's intelligence director told colleagues that enhanced interrogation techniques used by the Bush administration yielded important information that helped America deal with the threat of terrorism.
"High value information came from interrogations in which those methods were used and provided a deeper understanding of the al Qa'ida organization that was attacking this country," the Director of National Intelligence, retired Admiral Dennis Blair, told colleagues in the two-page memo April 16.
http://politicalticker.blogs.cnn.co...-said-interrogations-yielded-high-value-info/