Your argument would hold more water if it wasn't the US government's idea for Ireland to become a tax haven in the first place:
Nonsense. Just because a US consultant in Ireland mentioned Puerto Rico's economic successes in passing, does not equal an endorsement of US tax evasion by the American government. And even if the US government agrees with the "Double Irish" (actually this loophole is being closed in a few years), it doesn't mean that the American people would endorse having their money funneled into private corporations that don't even pay taxes. There are plenty of other small countries getting rich through economic injustices and obfuscation as well (e.g. Switzerland).