The recent movie "Zero Dark Thirty" explained the truth that waterboarding, and related enhanced interrogation methods, produced the crucial elements that allowed for OBL to be now dead. However, even though the movie got great initial reviews, the Hollywood leftists are now on the warpath to put it down ( Web Link ).
Apparently, free speech and expression are not allowed by the lefties. Duh...nothing new.
Bottom line: Waterboarding worked, and the leftists are opposed to telling the truth...and punishing those who do tell the truth.