Is this not taking a literal interpretation of his words a bit too far? Is your scenario really that because someone can stick their hands in their pockets and refuse to take the US dollars (and then a court declares that the debt has been paid), they didn't actually HAVE to accept US dollars because they can just stick their hands in their pockets? By that reasoning, I don't HAVE to not murder people, you can't make me, it's just that the courts will put me away for life. The whole conversation becomes meaningless.