That's the thing - we would never use them - they are a necessary deterrent. Just look at Ukraine.
It's (of sorts) a mexican standoff - but no Country would push the button. I come back to my first point - no NPT states have gone to war with each other since 1945.
Yes - it's no surprise that the worlds major nuclear powers (NPT signatories) haven't gone directly to war with each other since 1945.
We would never use them - but they act as such a deterrent. I honestly think Russia would not have invaded Crimea and Eastern Ukraine if they hadn't given up...