your last remark might hold some of the strategic reason to holding nukes from the perspective of political leaders and security forces, it might serve as a reassurance to prevent catastrophic conflicts when you know something as devastating as a modern nuclear bomb is ready for use by one of the sides.
On the philosophical level, yes it does seem insane that we have reached the point where our technology is presented at its pesk in warfare-related technology, keep in mind, that there isnt a weapon that was developed by humans and not used, so who knows whats in store for the future.
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It requires a very unusual mind to undertake the analysis of the obvious