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?
How do you prove that the software installed is the same software the source code of which is available to the public?
@rockslice addressed this in another comment - you use signing certificates to verify it’s the correct code, which is a widely accepted method.