You misunderstand, it's not that they're all powerful or incapable of error, it's that we've reached the point that it clearly doesn't matter anymore. If there was even a sliver of an iota of a chance of Trump turning this around, the powers that be wouldn't be acting so cocksure in victory. Not of course, that Trump can't do it, but the powers arrayed against him are much more potent than you seem to be making them out to be.
I would not be shocked in the least if, if any of these cases went to SCOTUS, they'd cuck out and give it to Biden to "keep the peace" or some such mealy-mouthed bullshit. I'm not saying it's impossible either, but it damn sure isn't likely. And, like I said, it would be in spite of the system, not in working with it. Judges are still at the end of the day, human, and like you were keen to point out that means they are capable of making mistakes. Or "mistakes", going by that one story of that woman who got death threats over this bullshit.