Yea but in other countries, even Supreme Court judgements can be appealed to an International Court - and have been many times.  I am not aware of SCOTUS ever having been over-ruled by an international court.  I am not even aware if it such an appeal has ever been allowed to proceed.  Effectively the USA is above international law even where (as in the Geneva Conventions) it has signed up to the International Law in question.

The question of whether waterboarding is torture, and whether those who justified and practised it are guilty of a war crime is ultimately for an International Court to decide - not SCOTUS or US radio talk show hosts.  

notes from no w here