Why the world community is silent about the role of China in Tibet?

For Dalai Lama the introduction of train service to Tibet from China, in reality, was just like a dagger making his way through his heart. Ironically, his attempts to keep Tibet away from the clutches of China have further tightened its grips. At this point of time it has become imperative for Tibetans to save its cultural landscape, if not greenery, from the well-calculated political onslaughts of the Chinese government.

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I wonder what has made US, the global watchdog, to turn a blind eye to political, social and cultural alienation of the Tibetans. I am afraid that with time cultural legacies of Tibetans would become a thing of past as Chinese come to strengthen their presence in this art of the globe. Sadly, Chinese government has been successful in shattering the citadel of Tibet's strange existence on the World's map.