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Read Alexander's WaPo OpEd before arguing bullshit "what if" Jack Bauer hypotheticals.
The reality is simple. Valid and reliable information can be obtained quickly without illegally torturing prisoners and torturing people pisses other people off and gives extremists a great recruiting tool.
Hence one of the reasons why Michael Scheuer claims the US is marching to the drum of Bin Laden and going down the "dark" road to hell, which is exactly what AQ wants.