I don’t think a scantron machine not connected to the Internet would sow distrust. We have seen them in our high schools. And Adversarial observers can validate the results on test samples quite easily.
Which raises the question- why do we use the really awkward, blackbox and sometimes networked machines that we do, manufactured by weird companies rather than whoever makes scantron machines or whatever?
And this isn’t just about “dumb Republicans” or what have you. Here’s Scott Aaronson [1] in 2016:
> For that matter, if Russia or some other power hacked the trivially-hackable electronic voting machines that lack paper trails—machines that something like a third of American voters still used this election—there’s an excellent chance we’d never find out.
“Antivirus on voting machines? You’re doing it wrong.” [2]
The thing that really gets me is, even if you wanted to use machines, you wouldn’t use the weird machines made by shady companies that we do. Different counties would buy standard scantron machines used to grade high school finals off the shelf, and verify it in ways that are obvious to all of us.
[1] https://scottaaronson.blog/?p=2957
[2] https://xkcd.com/463/