Such an individual would get a quick corrective lesson in the second amendment from my friends and neighbors. But once again, hyperbole. The US grid goes down. That sucks for up to a year and a half.

But hospitals and other critical organizations have generators and the national guard would be deployed to keep them fueled. And yes it will crash the economy, which is kind of a myth anyway. Buy solar panels and batteries, live off a well, and get to know your neighbors if you think this is likely. Also consider being like the Mormons and storing a 6-12 month supply of nonperishable food.

Regulating AI achieves nothing but to hand the 21st century to China. Regulating its deployment OTOH will not be allowed by companies like Meta and Palantir whose gross margin is reliant on it. I'm favor of regulating deployment. The research not so much.