Reading between the lines, you can see multiple rationales for supporting Trump's election stealing accusations even while knowing the are bananas. I suspect most supporters either switch between rationales or hold several of them simultaneously. Some are:
1. Metaphor - the real election steal was the alliance of institutions (from the media to the intelligence services to the tech oligarchs) against Trump in the pre-election period.
2. Truth through BS - They know there isn't enough funny business to change the result, but *pretending* there is might lead to election security reform and prevent the steal of some future, closer election.
3. Loyalty Test - This isn't about what's true and what isn't. It's about what side you're on, and if you won't pretend the election was stolen by George Soros, communist robots from Venezuela, you can't be trusted to hang tough.
4. Troll Logic - They ruined our fun with their Russia collusion fakery and this is our fackery payback.
4. Crook Logic - They are the enemy, this is an existential struggle and those struggles aren't *justly* settled by who got one more vote - or fifty thousand more votes - in Pennsylvania. So steal the election if you can get away with it.
This article is notable for its lack of interest in the truth content of the allegations by the Trump side. The accusations are just a pretext for psychic revenge (at minimum) or an election (if possible). https://americanmind.org/features/get-ready-for-a-fight/dont-give-an-inch/
This article is about straight up psychic revenge. https://thefederalist.com/2020/11/19/democrats-and-media-are-reaping-fruit-of-4-years-of-anti-trump-conspiracy-theories/
But most people on that side are more circumspect.