They have the easiest excuse of all: When their goofy, halfbaked conspiracy theories get thrown out by the court, even a Trump judge, the court is corrupt. This has been going on for years, and it saturates their worldview.
I don't think they understand how the legal system actually works. Just like they don't understand how economics, health care or foreign policy actually work. All they need is a storyline, like pro wrestling or reality teevee.
The damage this is causing may or may not be reversable.