“there are almost no mechanisms to prove it.”
Vote fraud can be proven in almost every case. But it takes more than allegations. It takes tedious shoe leather and hard work. It is easiest if both parties have a good ground game and personally know the voters in each and every precinct.
It is always the intent and work of a good ground game to see that BEFORE the Election, BEFORE the start of campaigning, that the list of registered voters is clean and accurate.
MAGA lacks a ground game. MAGA sits in front of the screen and thinks their job is to cheer and boo what is on the screen. No! the only job that matters is getting away from the screen; going out knocking on the doors of friends, neighbors and strangers.
In my experience, most vote fraud is in local elections and primaries..in low turnout elections. That is because vote fraud is much more often the winning margin and useful in a low turnout election.
Also, it should be noted that most local races are are one party. So the primary is where the winner is decided.
There is far more vote fraud in a Democrat primary than in the final. Watch local races in Fulton County GA in this primary that started this week and ends May 19. If Atty General Chris Carr...or anyone...were concerned about vote fraud they would be looking at the hotly contested local primaries.
(Note When I was in IL 1961-2013 there was vote fraud in the Republican primary as well as the Democrat. For example, there was much vote fraud that I personally witnessed against Republican Chris Lauzen and his faction in the 2012 primary coming from the Denny Haster faction.)
It takes a high ranking judge to let a case go forward and they always have someone to shut them down.
Do you remember all the suits claiming that the election was fraudulent not one case ever went to trial. Even the Supremes didn't let Texas bring their case to trial.
The States run crooked elections and then the people who ran the crooked election is the only people that can examine the election are the crooks who stole it. If ballots disappear it is just a techinal flaw nothing to worry about. If ballots are specifically printed on oversized paper that won't let the tabulation machines accurately count the vote, guess some low level clerk just made a mistake and the band played on.