And suppose you somehow fix all of that, and run it on a mathematically verified secure chip. How do you know vulnerabilities weren't inserted into the silicon, or perhaps the whole chip was swapped with a compromised one when you weren't looking. There's already been reports of factory compromised hardware for credit card readers.
With control of the entire USA as the prize, you can bet that's the level of attack you'll be dealing with.
This is just what a former CS professor told me years ago, but it seems to be supported by what experts are saying.
Edit: clarity and addl thought
We need a clear way to communicate why it's so dangerous that computer illiterate people will understand, and that's as clear as I can put it.