It’s not so much that it’s only the “I can’t in good conscience vote for this party, so it’s better that the objectively worse party wins” crowd is worse then “I want the fascist to win” crowd. It’s the first crowd might listen, while the second is a lost cause.
A lot of that is because rest of NATO is under US umbrella. Not like nukes are high tech at this point. Most of Europe could get nukes real fast if they wanted, but everyone has been better served by it being to many Nuclear Powers up to this point