Today it would be about the best for me - I'm old enough that I wouldn't be drafted, my kids young enough that this would likely be over before they are old enough. However I have nieces, nephews, and cousins of military age, some currently serving - all of them are in danger of getting killed if we were to let Ukraine join and thus I cannot be for it. I have a lot of sympathy for Ukraine, but not so much that I want my close friends and family to die for them.

The above or some variation represents most of the people (not countries) who are in NATO.