Think about attacks by BLM and ANTIFA on USPS vehicles during ballot collection in conservative areas of swing states! And sympathetic Postal Service Employees destroying ballots. It will happen!
Re: Postal workers
It has already happened:
W. Virginia mail carrier admits to attempted election fraud, changing political affiliation on mail-in ballots
July 12, 2020
https://www.bizpacreview.com/2020/07/12/w-virginia-mail-carrier-admits-to-attempted-election-fraud-changing-political-affiliation-on-mail-in-ballots-945768
And sympathetic Postal Service Employees destroying ballots.
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I believe something of that sort has happened, at least that made it into the news.