I agree with you that the existence of nuclear weapons is most unfortunate and countries shouldn't be allowed to pursue nuclear weapons programs but this: a refusal to fight seems increasingly sensible is nonsense.
All you need to do is turn on the news or read a paper. Reality doesn't match your dream.
Fighting is just as popular as it's ever been, maybe more so.
And sometimes there is justification for the use of deadly force. The armed policemen who shot dead the terrorists near London Bridge were 100% right to do what they did. They prevented more innocent people from being injured and killed.
I'm certainly glad the armed policemen didn't suffer from a bout of pacifism ...