I've not watched the documentary yet, but it's on my list.
I remember watching a few programs from around his death though.
On a side note I remember listening to an interview with Robbie Williams, he was talking about how much he struggled with being famous, and the fallout of being dumped out the back of the hype engine. Coming from someone who had a fairly normal upbringing then got surrounded by people wanting to keep you as an asset to make money. I remember hearing similar stories of Brian Harvey.
Now imagine that same pressure but on a child, and them never being allowed to be a child.
I don't really think it's that much of a stretch of the imagination to see how messed up someone could get with a seemingly endless amount of money, with an abusive father, was never allowed to be a child, and is forever surrounded either by paparazzi trying to force their way into every facet of their existence as well as a fleet of "yes" men
Not that this excuses any behaviour on anyone's part...