Having worked with kids that have suffered sexual assault/abuse the fact that he turned to drugs and alcohol makes no impression on me whatsoever. It is incredibly common to engage in self destructive behaviour after sexual assault (rape).
As for not having the problem in the first place, what is the next step? To blame him for having been sexually abused (raped)?
Get real people! Here is a kid whose father died when he was 9 years old, who was then thrown into a bunch monastaries, got raped and whose tutor then tried to kill him by knifeing him. And you are harping on him for having used drugs and alcohol??? I'm surprised he hasn't tried to commit suicide yet!
A little of that "theoretical" Buddhist compassion and a lot less judgement may be in line here. Walk the frackin' walk people!!!
What I imagine must be so difficult for these boys/young men when they have been recognised as tulkus of lamas who had large western followers, such as the case of Kalu Rinpoche, is that not only are they catapulted into the world of shady institutional power struggles and hypocrisy within their own culture but also into providing for the needs and expectations of thousands of westerners, needs which often are emotional and expectations that are often unrealistic.
I watched, over the web, Dilgo Khyentse Yangsi give his talk at Lerab Ling a few months ago. Whilst I personally have no reason to doubt that he is an authentic tulku and has great potential, he was still an eighteen year old adolescent being paraded around the world with no small amount of hype and hyperbole surrounding the tour, and seeming slightly uncomfortable and nervous sitting on a high throne amidst a sea of projections and expectations. To subject someone to these expectations at such a young age seems to me an odd expression of devotion.
It all makes me feel rather uncomfortable about the celebrity status that is pushed onto these young men. And when they do make mistakes, we kind of get all self righteous about the fact they should know better, when all they are doing is not living up to expectations others have put on them.
Perhaps what we are experiencing with Kalu Rinpoche is actually a timely lesson in how we approach the whole tulku issue, teachers, and devotion itself. And perhaps breaking the Omerta code and telling the world of what often goes on under the golden roofs of these big institutions isn't such a bad thing either. We are going to see more of that, I feel, from many places.