The problem with Tibet is not that it's a peacful society, the problem is that the Chinese are very strong and have a huge army Tibet can't win the Chinese by war and the world is not helping Tibet (because it has no interest, such as economic interest). The world is also afraid of China because of it's economical and military power and the fact that they will join forces with Russia (which is also a very strong empire today...).
The Tibetian people have no choice but to try and go in peace ways - because they can't win by force when the world is not helping them.
The Jews for example were in exile for 2000 years, until they got their country with the help of the world.
How long have the Tibetian people been in exile?
50 years? 60 years?
how many years did it take the black people to get equal rights?
or for India to get independence?
history shows us that some things take time and although we don't see the law of Karma - it always plays some kind of a role.
Who knows what the Karma of Tibet or China is?
it could be that in 50 years from now China will fall apart