There is a YUGE difference between having a few absentee votes mailed in vs. having every vote in the nation mailed in.
How many times has the post office lost your mail, delayed it, delivered it to the wrong address, etc? You trust the PO with every single vote in a national election? I don’t.
And not just USPS.
The opportunities are nearly endless for ways to steal the election, ways to screw it up, etc.
Imagine that you plan to steal or destroy mail in ballots. Or to replace them with fraudulent ballots. Now imagine that there are a few ballots from people who are out of town or for some reason need to vote absentee. How would you find those ballots? How many do you think you could destroy or forge? Now compare that with the situation where EVERY ballot is mailed in.
We’ve seen courthouses and police stations burning. What new targets might Antifa find in November? Post offices? That would be my bet.
Now imagine what would happen in a close election if an entire post office burned down (with ballots inside) in a contested state.
If you think the Bush/Gore hanging chad debacle was bad, imagine the chaos the DS could create with an all mail-in election.
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!