Ironically this just leads to the point where if everyone has nukes then eventually you'll start seeing people electing people willing to use them.
I agree that proliferation is bad but so far the only country that has been willing to use nukes is the US... and they may do it again on Iran, so unironically, the US is the country that just elected somebody willing to use them.
When Russia threatened to use them in Ukraine, Biden's response was not to nuke them back, it was to destroy every launching facilities in Russia because the point of having nukes is not to use them, it's supposed to act as deterrent.
However this philosophy requires sane leadership and belief in diplomacy which you don't even have yourself. Do you trust the current Trump admin in holding the gentleman's agreement the world had since 1945 ?
I am not saying South Korea or Saudi Arabia (or Iran) SHOULD have nukes. I'm saying that any country watching the current events and that has hostile countries around can only come to the conclusion that nukes is the best tool to protect your sovereignity if you have the GDP to build the program.