Waterboarding works if you need someone to say anything to get you to stop. Unreliable.

Do you know what is reliable? His own contradictions he's already made. Pretending that he is simply incompetent, and not doing so in bad faith, he is liable for millions of deaths, and trillions of dollars in damages.

In addition, ignorance of the law, is not a defense. He doesn't need to talk to be found guilty and executed for his crimes against humanity. His crimes are known. All we need is a country willing to prosecute.