Some of Europe is. Austria, Cyprus, Finland, Ireland, Malta, Sweden etc aren't.
Austria, for example, participated in missions in Africa, Afghanistan, the Balkans (KFOR, etc).
You really should learn about the subject you're trying to argue about.
So I'm not quite sure what the gain is for those members as they will not survive (the US might, but they won't).
Merkel might decide that she wants nothing to do with Russia taking Estonia, Romania, and Bulgaria. This is why we need technical solutions, not political ones. Banking on Europe being nice to each other is hilariously short-sighted and ahistoric.
Note, Europeans are free to leave NATO whenever they wish if they don't like our defense posture and technical requirements. I imagine letting the Russian military loose is probably not within Europe's self-interest, so enforcing technical requirements that protect all of Europe makes sense. It leaves less room for cowardly players like Merkel to appease expansionist dictators like Putin. If anything, the US did European security a favor with this policy.
That's not true.