That would only makes sense to me if rigging only one state was near useless. It's very much not. If you rig say, Florida, there's a fairly high chance of deciding the election.
An idea: https://medium.com/@dotnetmike/touch-screen-voting-should-be...
Machines just add more opportunities for fraud.
Combine this with voting machine companies being opaque, not recognizing obvious flaws and their executives promising to deliver states to particular candidates (https://www.commondreams.org/headlines03/0828-08.htm), and you begin to feel that all the suspicion is justified.
Isn't this the core problem with most electronic voting as currently implemented in the US? I mean, that no such guarantee exists?