It is not a monolith. Joe Manchin is not the same as AOC who is not the same as Bill Clinton. And they're not the people who voted for Biden whom you've never met or heard of, who live in Mobile, Alabama or Pugent Sound, Washington. Do you have a single liberal friend who you can talk with about this?
Are Joy Behar and Lebron James not both rich and famous? Do they not both speak on TV on an almost daily basis? The lower income people who pack Trump's rallies have virtually nothing in common with him, but they'll still support him even if he shoots a man on Fifth Avenue. But I know that doesn't mean that every GOP voter is the same.
There is no credible evidence of widespread fraud in the 2020 election. You could make a lot of money if you could uncover any. Trump would right you a big check if you could prove that he actually won enough swing states to make him president.
"People will cheat if you let them. This is a truism of humanity since the dawn of time." Will you cheat on your spouse if you can get away with it? Will you steal from your friends and job if they don't notice?
"If you mail ballots out unsolicited to everyone and then you make it impossible to validate the ballot you're going to get fraudulent ballots." Didn't happen. People were mailed unsolicited [strong]applications[/strong] to apply for mail-in ballots.
Biden was not a great candidate, but Trump was historically bad. Someone who simply didn't care about appealing to the center of the country and didn't care about making things better for most people, only pleasing his base.