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But is today's South Africa the same thing as the previous South Africa which had nuclear weapons? Are the people who authorised and developed South Africa's nuclear weapons still living in that part of the world?

South Africa didn't 'denuclearise' in the sense of giving up arms.

They had a change to a completely incompetent government who wouldn't know how to spell 'nuclear' let alone fathom the scientific research and economic and political strategy required to run such a program.

And given that nuclear scientists and competent political strategists tend to be smart, they don't hang around in swamps very long.

Sweden had a nuclear weapons program in 1946-68, and probably doesn’t regret terminating it:

https://en.m.wikipedia.org/wiki/Sweden_and_weapons_of_mass_d...

It wasn’t close to delivering actual warheads though.

Using downvotes as any kind of metric is usually (perhaps not always) nuts.