Fame at the level Michael Jackson enjoyed it alters people.
It gives the individual the belief that they can literally do as they please all day long - because they are surrounded by people who not only facilitate that attitude, but actively encourage and applaud the individual for it.
Apply that circumstance to a normal level-headed emotionally mature man, and you have the serious danger that he will be irrevocably altered by the life he will lead.
Apply that circumstance to an already emotionally damaged immature man who has never known what normal life is, and you have the circumstances that lead to scenarios like the ones being explored in the documentary.
My 'verdict' is that I don't know, because I can't know, and neither can anyone else on here.
Anyone taking a 'guilty' or 'innocent' stance can only ever be expressing a view, and nothing more than that.