Nuclear disarmament is over because, otherwise, you’re putting your nation’s sovereignty in the hands of the US electorate. Would you trust them with your life and future? I certainly wouldn’t.
If you can’t trust superpowers (including the US), you have to protect and defend yourself. That’s the nuclear way (and perhaps a bit more percentage of GDP towards defense for everyone).
In a civil world, it wouldn’t be necessary, but based on who keeps floating to the top of the power hierarchy, it’s mandatory. Maybe a nation worth trusting will rise again, but I’m not hopeful.