Honestly? It’s a great deterrent. Have you heard of a nuclear power being attacked for real? Ukraine disarmed voluntarily and see where that got them. Everyone should get nukes and threaten everyone (or „warn” if you’re Israel).
Mexican standoff nuclear doctrine, you’ve heard it here first.
Not only have total nuclear armament for every country on Earth...
Every country on Earth also employs Israel's Samson Doctrine.
Which is: If we're going down, we are sending a nuke at every nearby capital we can, ally, foe, neutral, doesn't matter; if we can't exist, no one can.
Which is: If we're going down, we are sending a nuke at every nearby capital we can, ally, foe, neutral, doesn't matter; if we can't exist, no one can.
And that guarantees they’re never going to be existentially threatened. Now let’s have that for everyone so it’s actually fair.
... and it only works if all governments are rational actors that can reliably safeguard their nuclear stockpile. If either of those cease to be true, Bad ThingsTM happen.
Alternative is nuclear powers do what they want to everyone else. As someone living in a non-nuclear capable state I think that’s something that should be fixed asap, for our benefit, and others must be thinking that too. Especially after how worthless security guarantees turned out to be.
It's pretty dumb as a deterrent because a single miscalculation and it would set off a chain reaction that ends human civilization.
Think of it this way: because nuclear missiles are not immediately traceable to their country of origin, each nuclear-armed country will immediately launch at their perceived enemies without validating who attacked them. All it takes is one launch. This might deter a sane person but we are led by narcissists and these are not rational people.