Way to pull that out of the air. That's your opinion, and it's incredibly misguided.
OBL was behind 9/11; he made no bones about it. He also made no bones about his intent on future attacks. He was an international fugitive, criminal & mass-murderer. We have every right & moral authority to hunt such a man down, and if those hunting him down feel endangered, shoot if necessary.
Waterboarding is method of interrogation that we either choose to practice as a country, or not. If we do, I think you'd be hard-pressed to argue that it "enhances" our moral authority both on interrogation & on human rights in general.