Earlier quoted context omitted.
This is not a one sided thing. The US has been allowed to do a lot of things under the NATO umbrella that it benefited from (such as: selling a vast quantity of arms). Soft power is a thing and the North Atlantic Treaty Organization came into being to deal with exactly the kind of situation that we are viewing today. To see the US bow out, and in fact threatening allies is duplicitous at best.
NATO came into being to deal with the USSR, which was the preeminent threat to all NATO members. The US wasn't expected just to come save Europe; European states had real military power and the will to bring it to bear against the US's main adversary. In a conflict with the USSR, the US could rely on Europe to fight with them. Very valuable. Today, US policymakers see China as the main adversary. But European states…
Are the French going to be parking the Charles de Gaulle alongside American aircraft carriers in the Taiwan Strait if push comes to shove in the Pacific? I wouldn't entirely discount it. But maybe more importantly, even if they're not, does making an enemy of the EU negatively impact the ability of the US to park American aircraft carriers there? Certainly damage to the Atlantic trade relationship is unlikely to do the US any favors economically, which is important if the US wants to keep funding the Navy. And a potential loss of European controlled military bases has the potential to negative effect the US military's logistics, which is where the real superpower status comes from. Maybe most significantly, how would such a shift in alliances impact the willingness of Pacific allies to support the US, which obviously does have a direct impact on any conflict with China.