Earlier quoted context omitted.
You’re assuming the people in charge are sane, rationale, and value past decisions that have worked out. It’s quite clear with the now likely permanent damage to NATO this isn’t the case.
You're assuming NATO is somehow critical for the US. It is not. NATO is critical for the European powers (those not named Russia). The US doesn't require it. The US doesn't need to defend Europe any longer. And it's clear the Europeans don't want the US there, so it works out great. Europe can boost its defense spending by ~$300 billion to make up the difference, or not, whatever they choose to do is up to them. The…
To be pedantic, Canada is a major non-European NATO member.
And then there are allies, some of them designated by Trump:
https://en.wikipedia.org/wiki/Major_non-NATO_ally
Or, they were, as there is no certainty under his rule.