He makes a great point here:
If you find any voter fraud at all, you have to assume there’s more of it. And you have no way of knowing how deep and extensive the fraud is. You have no way of knowing you caught it all.
Sure, the side that gets caught cheating will try to blame it all on a patsy/fall-guy and act like it was a unique and localized problem, someone went rogue, etc.
But nobody on the other side would actually believe it was a rogue election official or a one-off.
Any deliberate vote fraud that goes unprosecuted and unremedied completely destroys the integrity of the election.