Re: John Bonham
i own two bonham biographys and have read several zep ones plus numerous articles and interviews and there is no mention of heroine. bonzo was a heavy drinker and was suffering from depression due to touring stress and the possible break up of the band. he put away far more vodka and other drinks the night of his death than any one man should. certainly enough to put an average man in a coma. occasionally this bonham on drugs thing comes up but i have never read it in any official writing.
i do agree strongly with the rest of your post tho.