I think there's a good reason for the trust as well: mutually assured destruction. Sure, you can knock out a power grid with seemingly trivial means. But once

I think there's a good reason for the trust as well: mutually assured destruction. Sure, you can knock out a power grid with seemingly trivial means. But once you do, you're just as shit out of luck as the other guys. It's pretty much the "too big to fail" scenario. Too much of the infrastructure we've become dependent on is just not worth taking down in an attack. Sure, GPS may have a single point of failure... but GPS is kind of useful for you as well so you don't really want to knock it out. You can't afford to replace it. It's like these systems are just sitting around saying "Fuck with me and I will burn this whole place to the fucking ground. The fucking ground"