Not because it is easily corrupted - it’s not - or because it is part of a Democratic conspiracy to steal the election - that’s fucking stupid.
But if we all vote in person, Trump will have one less reason to tear apart this country when he loses.
That is truly the worst-case scenario. And as this article suggests, it is not far-fetched. In fact, Trump is preparing the ground for a major crisis.
Link: https://www.bostonglobe.com/2020/07/25/nation/bipartisan-group-secretly-gathered-game-out-contested-trump-biden-election-it-wasnt-pretty/