> But now consider a counterfactual scenario – a ‘safe first strike’ – in which some technology made it possible to completely destroy an adversary before they could respond, leaving them unable to retaliate. This is why I have been opposing Missile Defence. Strategically missile defence is a highly offensive technology, since it allows a safer first strike capability.
Israel's Iron Dome is one thing. They're destroying small, short-range, generally unguided missiles carrying conventional warheads without decoys. The US's anti-ballistic missile systems (e.g. GMD, SM-3, THAAD, Patriot, etc.) are unlikely to provide meaningful protection against ICBMs even from relatively unsophisticated enemies for one reason: it's substantially easier to build swords than shields. If North Korea builds a missile that can carry a nuclear warhead into the US mainland, they can build the technology to stuff decoy warheads into the payload (eg balloons with the same signature as the actual warhead).
You really don't want a nuclear enemy overestimating the effectiveness of your missile defense!