...look. SAC is running 8" floppies. 'member Wargames? There's a reason they started it out with Michael Madsen failing to launch - they needed to wave hands and get rid of all the humans in the silos.

But it's been 35 years and the humans are still there. The tech has not changed. The doctrine has not changed. The Soviets probably built something Strangelovian but it's about as smart as an automatic transmission.

More than that, you're not talking about a malevolent AI, you're talking about an ISIS hacker. And okay- maybe your argument is ZOMG ISIS could hack our silos or something. But you can no more hack a missile silo than you can hack a garbage truck. It's not an access problem, it's a sophistication problem. Never mind the airgap. There simply isn't the instrumentation or automation that would allow a garbage truck to so much as malevolently drop a dumpster.

And that's at the heart of most of your worries - oh shit an AI could take over the world and wipe us all out. But that pesky "take over the world" part is messy, man. It really is. There ain't a lot of the world that's automated and that's not likely to change - "automated" is very different from "mechanized" or "computer-controlled" or even "digital."