Visit freetibet.org today and read up on this world issue.
You should read the RCP's essay on Tibet. It is provocative and to the point. Tibet was an feudal dicatatorship where the dalai lama presided like a godking. He was in active collaboration with British and later American imperialism. The lamas did no productive work, but like the Catholic monks in european history, lived off the exploitation of a massive peasantry.
There was a marked shift in Chinese policy towards Tibet from early in the revolution through the cultural revolution and then again after state capitalism was established as the dominant economic system beginning in 1976.
Slavery was only abolished when the Chinese invaded. That is a fact, not "RCP propaganda." It's nice to hold up the noble kingdom myth, but a free Tibet means more than getting out the Chinese. It means freeing the people for despotism of any kind. The campaign for a free Tibet often takes the form of demanding that the Tibetan aristocracy living in exile be allowed to return in force. Who wants that?