Earlier quoted context omitted.
I'm skeptical things would have lasted this long if the "US never really believed in its own ideal or took their own laws seriously". I think you're letting your cynicism for this moment run away with you.
American involvement in the Nuremberg trials set the stage for the modern era of international law. It began with the United States, along with the allied nations, constructing a post-facto legal definition of crime against humanity that somehow included the Holocaust but excluded both the American campaign in Japan and various Russian war crimes on the Western Front. It’s not cynicism to point out the clear hypocris…
As are the Japanese.