US law can change whenever the US wants it to. It's like saying you hold yourself accountable not to cheat at your diet. You can just change your diet and then you're not cheating it anymore.

This is silly. There are consequences to breaking trade and resource agreements and countries will retaliate with tariffs and other means.

if you gain a reputation of a country that does not honour agreements, no-one will be interested in doing agreements with you.

That’s true, but the GGP seemed to be arguing that the fact that treaties are defacto US law is sufficiently important to preventing the US from breaking an international treaty.

I agree with you and others that the driver for abiding by treaties is not US law but us reputation. But that’s the GP’s point: the law is not the main driver here.

Sure, but I don't need layers of bureaucracy and multiple branches of government to ok the change in my diet. Let alone an international community who will hate me for it.