Correct me if I'm wrong, but as far as I know the majority of Tibetans were before the Chinese slaves in an absolutist monarchy/theocracy that used extremely cruel torture and punishments. (amputation of limbs, skinning, cutting off ears/noses)
Let's be honest here, this whole Free Tibet business is just about pressuring the Chinese government and nothing else.
If it advances the US governments strategic goals then they will even support barbarians like ISIS.
Unfortunately for the US the Chinese government is quite resilient.
They are not even trying to stir something in Tibet anymore, that one has failed. Currently they are trying hard in the Muslim Uighur regions, but apparently it doesn't work any better.
The Chinese will just crush any externally supported resistance, they don't give a crap. Nor do the Russians.