The power to veto is also part of the laws of the land. Checks and balances or something
No arguments, what the US government did is legal, but the next time Apple slaps a legitimate claim on Samsung in foreign countries this has got to be at the back of your mind. On the one hand, yes, the US needs to nurture American interests, but it also needs to weigh up the gain of preventing a small, relatively insignificant sales ban with the detractment to the legitimacy of patents globally which this intervention brings.