I don't even see how they are a deterrent.It would be fantastically short-sighted to get rid of our nuclear capability. It's not something you can just whip up again in an emergency.
It's easy to say "we don't need it" in these (relatively) peaceful times....being reliant on the US for protection is not a desirable situation long term.
If a person invades you with a conventional army you are not going to retaliate with a nuclear strike, this will result in self-annihilation - which is worse than occupation.
Neither would it act as a deterrent for another nation nuking you, as the dust created from detonating nukes on a large industrial nation such as ours would result in global starvation, crop death & global instability. That's ignoring the very high prospect of nuclear escalation which would yield the same impact. You don't really need to nuke somebody back to cause escalation or global annihilation.
I don't get what it's preventing, as it's a bluff you can't use if you want any of your own people to live.
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