I don't get that. How is prosecuting Trump for refusing to turn over and concealing important national security documents partisan (I can see that argument with the Bragg case, but this is a special prosecutor, and he seems to have an extremely solid case, and as Sununu said, Trump was given many chances to avoid this and it is a totally self-inflicted wound)? I prefer that he not actually be jailed, but conviction and some penalty are necessary as he and his supporters consider him above the law.
Trump is mentally ill. The people I really blame for him are the Evangelical preachers who have declared him to be anointed by God to rule over us and have sold that to their parishioners. For those of an end-of-times-are-near fixation, it seems far more rational (not that anything about Revelations is rational, and seemingly still a mystery how it failed the screening of potential New Testament books and still made it into the Bible) to view Trump as the anti-Christ.
I have no idea what you would see as a nonpartisan prosecution. Prosecutions are decided by prosecutors or Grand Juries. Apparently both a Grand Jury and a Special Prosecutor found grounds to bring a criminal case against former President Trump. Criminal cases are supposed to be determined on the facts, not political consensus. This is not an impeachment, which almost has to be bipartisan. Federal Prosecutors have always been appointed by the president/confirmed by the Senate. State AGs and local District Attorneys are elected. Unlike judicial elections, these are not nonpartisan elections.