There was the episode where he held his baby son on a balconey, or some such place, and appeared to not have a clue, possibly putting the child in danger, but regardless of it all, (and I know I thought the worst myself for a long time), things can be misconstrued, and there is something in the counter arguments seen above.
Just a view there, I've no real idea, but the point I made earlier about too much fame, at too early an age, still holds true doesn't it, so little wonder he went off the rails and needed all kinds of drugs/medicines.