Are you retarded? Absentee ballot is different than voting by mail. There is a process of requesting it and identification. Ballots by mail is mass mailings with no process to verify other than an address on file which may or may not be right.
What's to stop me from printing thousands of ballots and voting Trump by mailing them in. It's easy to do. Would you be fine with that? Now imagine that on a large scale. If Republicans stole the election that way would you approve?
Libtards have shown time and again their hatred of Trump. They make shit up on a weekly basis. What's to stop them from using fake mail in ballots? Nothing.