Comparing your posts to the article by Joshua Michael Schrei you clearly know far less about Tibetans and history. His writing shows a far greater objectivity, more detailed sourcing (he doesn't rely on "I have read") and a use of a reasoned faculty that you have no concept of and that isn't hard to see.
The author makes his own case and he certainly does more to substantiate it than to say "I read a Cambridge History of China." So far that is all you have offered. Not even one cite from the almighty source.