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And when the incentive to use diplomacy is lost to some perceived first-strike capability we face extinction. You're not wrong, but the argument is not that simple (either).

Also, as a result of MAD the main risk of nuclear weapons would be operation by a terrorist group as opposed to a nation - who wouldn't be affected by a national nuclear disarmament and wouldn't be able to have retaliation in the same way

I don't think this warrants a downvote—nuclear deterrence is as valid an argument as the parent comment which states that nuclear disarmament may contribute to peace.