This thread by @martyrmade hits the nail on the head
I think I've had discussions w/enough Boomer-tier Trump supporters who believe the 2020 election was fraudulent to extract a general theory about their perspective. It is also the perspective of most of the people at the Capitol on 1/6, and probably even Trump himself.
Most believe some or all of the theories involving midnight ballots, voting machines, etc, but what you find when you talk to them is that, while they'll defend those positions w/info they got from Hannity or Breitbart or whatever, they're not particularly attached to them.
Here are the facts - actual, confirmed facts - that shape their perspective: 1) The FBI/etc spied on the 2016 Trump campaign using evidence manufactured by the Clinton campaign. We now know that all involved knew it was fake from Day 1 (see: Brennan's July 2016 memo, etc).
These are Tea Party people. The types who give their kids a pocket Constitution for their birthday and have Founding Fathers memes in their bios. The intel community spying on a presidential campaign using fake evidence (incl forged documents) is a big deal to them.
Everyone involved lied about their involvement as long as they could. We only learned the DNC paid for the manufactured evidence because of a court order. Comey denied on TV knowing the DNC paid for it, when we have emails from a year earlier proving that he knew.
This was true with everyone, from CIA Dir Brennan & Adam Schiff - who were on TV saying they'd seen clear evidence of collusion w/Russia, while admitting under oath behind closed doors that they hadn't - all the way down the line. In the end we learned that it was ALL fake.