Why does Donald Trump need immunity if he's innocent?

[SWE]

This is a dumb question. It's obviously preferable from the perspective of literally anyone to not be tried at all than be tried and acquitted. The risk-cost analysis doesn't change if you're guilty or innocent. If you're wrongfully charged and have a credible immunity argument, 10 out of 10 people will pick the immunity argument before they're willing to go to trial.

[SWE]

In the MAGA cult's logic, Trump is unlawfully prosecuted by a politicized justice system. Therefore he needs immunity even though he's innocent in their view.

ALL of the prosecutions of Trump are founded on novel legal theories.  None of them are slam-dunk cases, and the State cases rely on extremely novel legal theories, to put it mildly. 

As for the Documents cases, why weren't Pence and Biden prosecuted?  Trump is the only one of those individuals who could have possibly justified having those legal documents at his residence.  The "He didn't cooperate with the National Archives!" argument is ridiculous, in that (A) Trump had the power to declassify documents whereas the others didn't, and (B) the fact that someone "cooperates" with "investigators" has nothing to do with whether or not a prosecutor files charges.  (It can be a mitigating factor in sentencing, but it has nothing to do with whether or not the elements of a crime have been demonstrated.)

LMAO