Trump has three characteristics:
1. Totally amoral.
2. Cannot understand other people. He projects his own values onto others.
3. Prefers to win through some clever scheme over an honest approach.
If he was totally amoral, but dispassionate on how to maximize his odds of winning, I think he would have chosen the “honest” straight-forward approach, and just advised his voters to use mail in ballots.
How to argue with Trump supporters:
Don’t point out how immoral or racist Trump is. Don’t point out logical reasons why we know the election was fair. That the manual recounts matched the machine counts. That the mail in ballot voter signature matched what was on file.
Instead, point out how ridiculous Trump was to pursue the course he did. Discourage his voters from using mail in ballots, which depressed their votes. And then tried to get the mail in ballots tossed out after the election. In case after case, even Republican appointed judges, even Trump appointed judges, pointed out that you can’t do that. If they should not be counted you need to bring suit before the election. Waiting till afterwards is too late. Something Trump should have anticipated.
As George S. Patton said “America loves a winner, and will not tolerate a loser. Point out how ridiculous Trump is. Once they realize that, it will be much easier for them to see that the election was fair. But as long as they see him as a winner, you are not going to get anywhere.