I think he was likely a sweet-natured fellow with a mischievous side and a real dedication to fulfilling his destiny.
Hard to attribute bad things to a guy who so earnestly performed for an imaginary audience as a youngster. Sure, he was obviously entertaining himself, but with a mind toward entertaining others, as well. He realized what his dream was, and made it happen. That part is inspirational.
I likewise greatly enjoyed "Was This Man a Genius?", and still have not eaten my two cans of College Inn chicken broth.