I really loved reading your summation. I think there's probably elebenty bajillion different factors creating a perfect storm when it comes to famous people who commit suicide or die from drugs.
Famous or not, I think the way we handle things in society at large needs a big shakeup. I think kids need to be taught coping skills in school...how to cope with money, how to communicate effectively and build relationships. I also think advertisers selling the latest and greatest tv/lipstick/car/prescription medication as way to instantly become happy and perfect have a lot of culpability. For celebs I guess when they are instantly gratified with everything they want they do begin to feel empty.