My Problem with Robert Mueller's Testimony

I heard some of the Robert Mueller testimony yesterday before two House of Representative committees and was dismayed at his apparent lack of knowledge of passages in his own report, his evasiveness to often simple questions from either party, and his general presentation as somebody who simply did not want to be there.  Charges of feeblemindedness and figurehead are now cropping up about him, and I wonder whether, during these past three years his public image, with television continually depicting him as a sharp professional who was completely on top of things, wasn't monumentally inflated.  How much input did he actually have in this report of his...or was he just somebody put up there "in charge" to legitimize it?  And about this exoneration issue: when someone is investigated and prosecution is not recommended, those performing the investigation are supposed to abide by the principal that the target of that investigation is to be presumed innocent in the absence of any charges.  To not affirmatively assert that Trump committed obstruction during the investigations of Russian interference in the 2016 campaign places should translate into a return to the default position of innocence on the part of the President, legally and professionally speaking.  Now you and I as private citizens can differ on how much Trump is guilty of this or that...and he can still be impeached since that process is a political one...but from the perspective of a Justice Department counsel claiming possible guilt after refusing to press for charges is, in my lay opinion, unethical.  Not that I care a whit for Trump, mind you...but this reminds me of something that happened in Gainesville's tragic past...

In the late summer of 1990, a succession of grisly murders of young people occurred in my hometown.  The pressure was on the police to quickly nab a suspect, and conveniently for them a suspicious, mentally disturbed young man was available to present to the public as the likely murderer.  Only one problem: he was innocent, and later on they discovered the true murderer, who at the time was in a Marion County jail and had audio-recorded his own diary of his crimes.  But even though the first suspect was subsequently released and not charged, the Gainesville police chief at the time publicly claimed that he still believed that this individual was somehow tied in with the murders even though he was legally exonerated, damaging his reputation in an entirely unprofessional way.  So since then I've been sensitive to this notion that if an investigator won't recommend charges against someone then they should refrain from expressing their own personal biases.  Then-FBI Director James Comey violated this principle in July 2016 when he went on a public rant against presidential candidate Hillary Clinton for her unsecured emails while not pushing for her prosecution.  Now coming back to the present, I'm always hearing how upstanding and professional Robert Mueller is...but he's doing the same thing, in my estimation, with Donald Trump that Comey did with Clinton...