This is no different than any other addict. We see it as a higher fall since he's falling from money and fame, but it's less sad than when people lose their loved ones, their kids, their marriages, their homes, their lives, their freedom etc.
Sadly I'm much more accustomed to that scenario but have apparently become desensitized to it. I've had to stop "enabling" people in my life more times than i would care to count. I always thought he would straighten himself up before he lost everything but I see that isn't going to happen.