Mail-in voter fraud is no myth. There are numerous instances proven in court of voter fraud with absentee and mail-in ballots. A Congressional election in North Carolina was overturned.
Cheating is way too easy when live ballots are mailed to all registered voters. Some get mailed to the deceased who somehow rise from the dead to send back their vote. Others get sent to people who have moved away. When third parties are allowed to distribute or deliver ballots, the opportunity for cheating is put on a silver platter.
Beyond fraud, mass vote by mail portends chaos and delay. Results from the New York primary from a month ago are still up in the air.
What if the same thing happens in November and New York’s vote is still being counted and litigated a month later in December. It might end up in the Supreme Court. With his Tweet as bait, Trump has cleverly got you and everybody on both sides to declare there will be no delay. Even if millions of mail-in ballots from NYC are disallowed or remain uncounted by the deadline, the Electoral College vote will take place as scheduled. Could Trump take New York?