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This seems like an incredibly bold assumption to roll the dice on, you know, given you’re talking about almost all life on Earth.

I’ve also never heard of a defence system that can pluck that many missiles out of the air. The closest I’ve heard of is the Iron Dome - which would not be able to stop what you’re talking about at all. I would think the nation that has that capability would make it known for geopolitical reasons.

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While I agree that anti-missile technology is extraordinarily unlikely to be as effective as hoped for upthread, if it did exist at that level of capability, the owner may still wish to keep it a secret. If it becomes known that your enemy possesses the capability to neutralize your primary weapon, you are likely to take counter-counter-measures, which could undo the advantage.

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