So we go to mail in voting, all those votes, crowded into one space. Who knows what funny business could happen before they are counted. Think of all the opertunities to find votes in the trunks of Democratic poll workers. Millions of votes, coming in from all over the nation. No way to insure they are all from the actual voter.
A few percent of fraudulent votes would not turn an election, millions would. With most votes now coming from closely watched polling stations fraud can not occur. With 100% of votes floating through the postal system, well, who knows.