Okay, here’s some evidence…
https://www.washingtonexaminer.com/restoring-america/fairnes...
https://www.forbes.com/sites/alisondurkee/2021/10/11/michiga...
https://abc13.com/texas-vote-by-mail-fraud-ken-paxton-in-bal...
Now your turn, what is the harm in making people prove their identity to vote if IDs are provided free of cost?