Forget "cold-blooded" or "terrible"; you're ignorant and spouting idiocy.
Your relative's story is untrue, a disproven urban myth, incorrect in every detail, that wouldn't have worked even if we had tried it.
http://urbanlegends.about.com/librar...k_pershing.htm
WWII interrogators have publicly denounced Bush-era "enhanced interrogations". They weren't "ruthless", they were friendly and often sympathetic to those they were questioning. And they got amazing results.
http://www.outsidethebeltway.com/wwi...odays_methods/
Oh, and as for "nuking the entire region", leaving aside your apparent psychopathy, destroying even a significant fraction of the Mid-East's populated areas with nuclear weapons would dump massive amounts of radioactive fallout into Earth's atmosphere, crash the global economy, and likely have significant negative impacts on the global climate as well.