No, it is not their decision. No anti-American decisions can be tolerated by our enemies.
Bad enough that allowing them to form the EU (an empire based on anti-Americanism) went through, thanks to Democratic fearmongering during the Cold War (the presumption of building up a “bulwark” of that manner against the USSR, particularly one that was based on the USSR).
What is anti-American? Anti-Amercian is interfering with the free markets by the US government, because it ruins the American reputation big time.