I see stories about how election is rigged or that there are security vulnerabilities and lots of people don’t believe the outcome. Why don’t they just open source everything so that anyone can look at the code and be sure the votes are tallied correctly?
My county/state does paper mail-in ballots by default (they look like this ) As someone else said, a machine does scan them (like the standardized test forms in school), but the paper ballot is saved, for review, if necessary.
There are plenty of people that take issue with mail-in ballots too. People are just never happy, and seemingly want someone to feel “in the know” about (eg conspiracies)