Because unlike Argentina, the US have for the past half a century dedicated countless resources to controling the geopolitical aspects of the so called free market. The iniciative is theirs, the regulations agreed upon under their global supremacy prevent the rest of the western world from sabotaging their interests like they sabotage everyone elses. Their systematical building and strengthening of a global Pax Americana means the other nations don't have the will to be economically agressive towards them.
With Argentina, nobody had an issue with bringing them down. With the USA is different. The petrodollar for example. If the EU had the political determination to challenge the US on the market terms they themselves preach as ideal, a small set of measures would have already replaced the Dollar for the Euro in the international markets. By all measuring standards, namely stability, the Euro is a superior reference currency.
You know who pushes hard for a shift for the Euro? Venezuela and Iran. IF the EU powers wanted to, we'd have the petroeuro already. But they don't, they have been US bitches for so long the polititians have lost the will and spirit necessary to get back on the horse. It all comes down to political willpower, EU has none. We lost it when we decided to sit back and let someone else rule the world. While the US uses it's security agencies to lobby and pressure and even kill any foreign individual or organization exploiting or revealing the possibility for competition, the EU sits back and stares at the shoes. Any attempts by Germany or France to pursue the iniciative on any international field are sabotaged by other EU governments bribed by US via economical or military agreements. Specially the eastern ones, who's fear of Russia makes the ideal US pawns. We are played, we know it, and we don't do shit about it.
Russia and China can't turn the tables on their own aslong as the rest of the world still bows to the US foreign interests. So, unlike Argentina who had zero control of foreign iniciative, the US are not coming down as long as the world plays by their rules.
/end rant.