Yeah, seems like a lot of justification going on there. Maybe it's valid and maybe it's not, but there appears to be lots of avenues for fraud. I don't like it, just like I don't like any online voting. Too many ways to game the system.According to the article you posted, they rejected about that many duplicate requests for ballots, not ballots. The error arose because people did not realize they had already requested a ballot by checking a box when they requested a ballot for the primary. There's nothing fraudulent about that. And even if it was attempted fraud, it was caught, so what's the issue? Trump has even told his followers to vote twice to make sure the fraud processes work. Seems like they do.
As for Kentucky, it's obviously bad that some mailman went rogue and threw out ballots, but 1) there were only 112 of them, 2) he was caught, and 3) none of them were filled out. The ballots that were retrieved were given to the post office to be properly delivered, and if anyone didn't receive their ballot in time, they could go vote in person.
To me, I think the safest method is to go to a polling booth and show your identification and your name gets crossed off the list and then you vote. Full stop. Pretty hard to cheat that system.
No identification, no vote.
When there's a crisis such as a pandemic, then delay the vote until there isn't one.