You're the one telling that story, I don't believe I've said that. In any case, if torture is not commonplace it is not a community norm. As far as I know, cases of waterboarding under colour of law in the US have been prosecuted.
You are the one who cited the president as a moral authority, saying he called enhanced interrogation torture, and this somehow validates the claim that enhanced interrogation is torture and is immoral.
Just because something isn't regularly practiced , doesn't mean it isn't accepted by the community. The majority of the community support the idea of the right to self defense, but most individuals don't encounter a position where they have to defend themselves. It doesn't mean that self defense is recognized as moral and legitimate.The majority of Americans support waterboarding, and thus by your community norms standard, the practice is moral.
Those cases mean nothing without context. Can you cite a case where a US Court has banned the use of waterboarding for US Military or Intelligence Officials or prosecuted and convicted them?