We find ourselves in a situation where the processes have been constructed in such a way that there is suspicion about the outcome and logistical difficulties at disproving what should be by design trivially disprovable, this just creates a terrible feedback loop of mistrust. The argument that we don't need better controls until actual widespread fraud can be proved in a court of law seems mistaken to me. We need the controls to keep us from getting to the point where a forensic analysis is needed to discern what happened during an election.
I realize that there are legitimate concerns that better voting controls can result in "voter suppression" but our haphazard approach to voting controls and process transparency has left us in a place where large numbers of people are suspicious and there doesn't seem to be any effective way to counter those suspicions in part due to the haphazard controls.
Stupid example: What if only Republicans were allowed to count ballots, and the only result you got was a number of votes that they told you, and they threw away all of the records. It would be impossible to get evidence, but you wouldn't need any evidence to rightfully distrust the result.
Purely electronic voting systems are analogous, though it differs in the details and degrees of things.