Two bombs killed anywhere from 150,000 to nearly a quarter million people. Who do you think those people were?

Mostly civilians, because the US loves to exterminate innocent people because it's an evil country. The US does not need nuclear weapons to kill civilians by the hundreds of thousands, though, it does that with conventional weapons every few decades.

However, Putin invading Ukraine was seen as “unthinkable”, regardless of what you think of the conflict there. Trump starting a war with Iran was far from a smart decision, and yet it happened anyway.

There's a world of difference between "bad idea that probably won't work" and "bad idea that can't work" - this idea that some craaaaazy dictator can come to power and use the nukes is a misunderstanding of how power structures work.

No matter how stupid or irrational any individual leader is they're merely the head of a much larger apparatus filled with other people who do know what they're doing. The wars against both Ukraine and Iran had a lot of other people behind them who thought it might work. There's a severe shortage of people behind the throne who think using nukes might work.

But you know what? It doesn't matter! You can't take away the any country's nukes, they'll nuke you if you try. That means you have to let everyone else have them to defend themselves and maintain sovereignty. Nuclear proliferation is inevitable, even if you don't like it.