Here is an interesting article in Slate about how Torture is Counterproductive. It covers how the notorious Khalid Sheikh Mohammed masterminded 9/11 and the horrific death of Daniel Perl. There is a link to the transcript of the confession itself where he confesses to almost everything except the murder of JFK. The article ends up with this insight:
This is concrete proof, as if more were needed, that it is not merely immoral to operate outside the rule of law, it is also profoundly counterproductive. Who could have imagined, in September 2001, that one of the masterminds of the attacks on the World Trade Center and the Pentagon would make his confession and the world would hear it with indifference?