I'm the first to agree usually, USA Defaultism and such is a huge annoyance.

But, while the following is just one theory, it was plausible enough to give me pause, and consider that there may be avenues for things to go badly that I wouldn't have thought of otherwise.

This scenario doesn't include the USA leaving NATO but instead not responding to Article 5 if it's triggered in an unimportant backwater corner of NATO, so functionally it's the same kinda idea.

https://youtu.be/ZY7GPBSyONU

If nothing else, certainly food for thought!