Yes I know, I think it is effective (because the CIA says so)
When people doing evil things defend the evil things they're doing in an effort to prevent being prosecuted, it's meaningless.
Why don't we listen to independent organizations? Or, perhaps, why don't we listen to people who've been tortured. We have a good example here. A former US presidential candidate, held as a prisoner of war and interrogated with torture.
http://www.mccain.senate.gov/public...committee-report-on-cia-interrogation-methods
“They must know when the values that define our nation are intentionally disregarded by our security policies, even those policies that are conducted in secret. They must be able to make informed judgments about whether those policies and the personnel who supported them were justified in compromising our values; whether they served a greater good; or whether, as I believe, they stained our national honor, did much harm and little practical good.
Why oh why, John McCain, did you have to take the crazy train on your journey through the elections?
Straw man? You just succinctly argued that it doesn't work.