That's a very easy one. Democrats manufactured and harvested a ton of fake ballots in democrat controlled urban counties, Pittsburgh, Philadelphia, Atlanta, Detroit. They violated chain of custody rules, locked out GOP observers, counted when there was no one to observe, and did not do signature checks. One way to show this is to look at the actual turnout in urban counties where cheating was largely prevented... for example look at the turnout difference between Cleveland and Detroit. It's a fraud they've been perpetuating for years and years in usually small ways, but was done massively due to huge numbers of absentee ballots and relaxing all the validation rules. No complicating voting machine conspiracy needed at all.
What is not rational is those who allege the voting machines were manipulated and after hand recounts show they were not, then then proceed to claim democrats manufactured the ballots afterwards to match the hand recounts. It's insane.. not rational.
You're claiming a huge number of high- and low-level Democrats in all those Democrat-controlled contested swing-state counties and major cities all conspired and perpetrated a massive, multi-state Presidential mail-in balloting fraud. So if you know that, then certainly Trump, his legal team, and the affiliated Republican legal teams, such as Powell & Lin, LLP, know all about that, too. So shouldn't it be mere child's play for Republican lawyers and investigators to get a huge number of those low-level Democrat poll workers to confess to everything, and then use those confessions to move up the chain to nab high-level Democrat conspirators?
It's now two months after the election and still no substantial Democrat poll worker confessions? Aren't there videos of Democrat poll workers repeatedly scanning the same batch of paper ballots? Sounds like all those Democrat poll workers are criminal geniuses and masterminds who have successfully evaded the law and authorities, and are thus worthy of having Hollyweird actors and actresses portray them on future Law & Order episodes!