The AI optimists are not that much more rational if you dig deep. Like any deep problem it is best to look at the facts not the hype and make up your own mind, outsourcing your thinking to other people never ends well.
Judgement, wisdom, and resistance to corruption are the 3 things that Tom Kuegler analyzes out of the psychology of Dune as the qualities for the human beings who administer institutions/government. Even if you design a totall perfect system of governance, it still has to be administered by humans, and humans vary in those 3 areas. So the question is, can we construct a system of governance that has better judgement, better wisdom, and greater resistance to corruption han human administators, while not transferring sovereignty to whomever controls the AI?