From a different perspective...
A treaty is not a simple thing. I am sure you have heard the phrase about choosing your battles, i.e. fight battles you really want to win and lose the ones you don't care enough about because they will generally help you win those others. In that light, I am sure there is a lot of winning and losing in a treaty. So, no, treaties probably are not 100% enforced for a myriad of reasons.
While the poster's comments may be a bit off keel, I would say that Nintendo can fight its own battles. They are not a US company and they should not expect US tax dollars to fund their particular war on piracy.