Same reason we have Republican elected officials in Congress that claim Biden stole the election from Trump when they were voted into office on the exact same ballots, handled by the exact same people, using the exact same process, voted in by the exact same voters.
The post-fact world is more and more going into full on dream logic reality denial where things not only don't have to be factually correct but aren't even required to have any form of internal logic or coherence.
The Republic Party and Demographic is 100% flexing on us trying to see just how wronger than not even wrong then can be before it bites them in the ass.
ETA: To expand on this.
We're seeing basically the same thing conspiracy theoriest did. I mentioned before that the whole big popular conspiracy theory sphere make a leap round about the time of 9/11 that didn't get talked about enough.
Let's look at the two Ur examples of big, broad American conspiracy theories; Kennedy and 9/11.
Obviously all conspiracy theories have multiple versions but the core most common version of the Kennedy Conspiracy theory usually goes something like:
There was a conspiracy within the United States government to murder Kennedy. They found a well known communist sympathizer to frame as a patsy, had the actual assassination carried out by a second gunman from the grassy knoll, faked/covered up all the evidence, and had the patsy killed so he couldn't talk.
Okay that's not what happened if you introduce actual facts and reality into it, but it's at least a good story. It COULD happen. If you read that in a spy novel or something it would work as an A-B-C sequence of congruent events.
Now take 9/11. Again multiple competing insane versions exist but most of them boil down to:
The United States government decides to fake a terrorist attack because reasons. So they fly fake planes full of people who never existed into the World Trade Centers which were also rigged to detonate with magic explosives. They then shoot a cruise missile at the Pentagon and say it is a plane. They create a narrative of heroic passengers that didn't exist taking down one of the flights before it can be used in a terrorist attack... I guess to give the story some heroic angle because of reasons. They then... attack a country who was harboring a terrorist who was already an international wanted man and later a country that had nothing to do with anything because... oil I guess.
See the difference? That doesn't make sense even if you believe it. It's just random nonsense that doesn't fit together or form a narrative. The actions and the motivations of the conspirators doesn't make any sense even within the context of the scenario we're being told.
Same thing here. The Right has moved on from stuff that isn't true to stuff that doesn't even make sense and all of them with a rounding error are sitting there with a chip on their shoulder and a smug insufferable troll grin on their face daring us to even notice it, much less do something about it.
