They have seen the evidence, and proven it to themselves. The court cases aren't viewed by them as incompetence, or even as corruption for the most part. They were about constitutional arguments. The democrats, media, liberals and establishment saying no ethidence no ethidence and then censoring them, is not viewed as oh we incompetently failed to prove it. It's viewed for what it is, lying about the nature of the court cases, inventing a fake narrative, and then treating the people like they are so stupid as to fall for it.
Oh FYI: to plead fraud in a court, you need to state the particulars of the fraud. Where it happened, how it happened, who did it, when they did it. You need to specify what the fraud is. This is why it was never pleaded, because it's literally impossible to know this. It does not however mean you cannot know that fraud must have taken place.
That's like a football manager continually blaming the FA, the refs and the opposition teams for losing. After a point no-one should be interested in excuses... it's a results game.