Purely political. I am not picking a side. Florida and other states should have done somehing earlier. It has been at least six years.
Trump was President from January 20, 2017 to January 19; 2021. Some repsonsibility and blame belongs on him for what went on during that timeframe.
To reply to just your post, I don’t think that states could do much without this “diary”. I expect that they could not charge a Federal officer with doing his Federal job. Now, however, they can charge him for the effects of his lies - and they can prove the lies.
At the Federal level, it seems that everyone wants to pretend that Fauci can commit crimes under protection of a Presidential Pardon. I can see why DC would want this, but not anyone else.
I suppose that Trump has nothing to gain by admitting he was duped. An understanding of what actually occurred would, I expect, show that, anyway.