> Jimmy Carter spoke about this, literally in some town the sheriff watches you vote and chucks it into the trash if you didn't pick their candidate.
That is a flaw of the American model of allowing local governments to run state and national elections.
In many other countries, local government has no role to play in non-local elections. All elections are 100% run by either a state or national elections agency.
I believe locally run elections are a good thing. As fraud would have to be perpetrated against multiple election systems. However, I also think there should be standards such as electronically tallied, hand-marked paper ballots saved for potential future audit.
Several other countries have independent electoral commissions running elections, as opposed to elected politicians. It is much easier for voters to trust the people running elections when they are required by law to be apolitical.
Look for example at the Australian Electoral Commission (AEC)
Simple diversity doesn’t speak to a level of security. All the attacker needs is time to canvas these locations, identify the weakest and then exploit those.
Given an adversary with basically X$s, they can target Y election types.
Having a common system reduces the variety, but ensures that there is an equivalent amount of resources to deal with adversaries.
For what it’s worth, India which has the most complex election requirements by a mile, uses a single system. Entered as an example of how election services are better delivered using a single system.
Lets start with, what "system"? There are a ton of governments that issue their own ID cards. Are you magically going to integrate with all of them or does everybody now also need a voter ID card issued from a singular source?
Next lets go onto "verified"? Historically there have been a lot of instances where the wrong black person was arrested because a white cop thought they were the guy in the photo. People cannot verify that a picture matches a face. This is going to lead to a bunch of discrimination complaints. There's also the big issue of people's appearances changing in less than 4 years. Or the simple case of a lot of people look the same and could just use each other's IDs (or get a fake one of that person).
Next lets go onto "just like they do at the airport". You can fly without ID [1] and you also might not be able to scan your ID [2]. They also don't check the photo against the system; just attempt to verify that the ID isn't fake and that the picture on the ID you gave them matches you.
Finally, the overarching idea that "voting by mail introduces fraud". It doesn't. Make a calendar event for ~1.6 months into the future to volunteer at your local election board and you can get first hand experience of the systems that keep 1 vote to 1 person in place even when using different voting methods.