The reason is simple. High-ranking people in the Bush administration approved this method of torture early on in the war on terror, and the technique was then used in the field. I think time will reveal that this approval was made by one or more of the following people: former Attorney General John Ashcroft, former Defense Secretary Donald Rumsfeld, former White House counsel and Attorney General Alberto Gonzales, Vice President Dick Cheney, and President Bush.
Despite abundant history to the contrary, waterboarding is not torture because this administration says so. Case closed.
Wesley Ross, Augusta