They're not insane; they're just lying. 15 years ago it was believable that control networks were airgapped from the Internet. But today, the likelihood that some low-level tech has plugged a wifi router into the control network for his own convenience approaches 100%.
This seems unlikely, based on a past experience writing software for a nuclear facility.
While nothing is unassailable, everything I experienced made me feel generally better about the approach these people took to safety. They wouldn't allow people to use spreadsheets to make decisions... literally this was not allowed, you had to have an app with testing and verification systems. Also, they pointed large automatic weapons at me while searching every crevice of my car, using long sticks with mirrors and various other instruments. It was a relief to see that they take security and reliability more seriously than any other kind of outfit I've worked for, ever. The monitoring had monitoring.
If you did that in my previous company, you would get a visit from IT and a good tongue-lashing from your manager within 15 minutes of doing that. As a 20-something, it seemed like an overreaction. As a 30-something, it seems perfectly reasonable.
Yeah no. Execute the managers - that'll fix it! Except its been tried (in history - feudal system etc). It results in management being entirely replaced by risk-taking con men, the only one who'll take the job.
You would think by now the US would have dumped some millions into developing some proprietary network protocols for the "kill the earth" button they've developed?
Is it so naive to imagine there are tech firms who could/would lobby for a no bid contract to do it?
I'm not an expert but I think there are some interests aligned there. If Trump has enough political capital to push plans forward to overhaul everything, this doesn't seem that far fetched.
15 years ago the world was still coming to grips with cyber security, in the desktop realm it was a race to install and patch windows xp before it became infected with malware.
Today if infrastructure is not 100% airgapped (and even that isn't necessarily enough) then it should be considered criminal negligence.