well if u don't judge by the media then ask Tibetans, how many Tibetans want independence.
That's one version of the story, but I've heard many already.
Besides, if it's true it only sort of proves how the Dalai Lama isn't anywhere near the 'rightful leader' of Tibet anyways... but that's less the problem as the whole conflict definitely revolves around mainly the resources of Tibet, aka lots of money and power, if you ask me.
Then the resources belong to China as Tibet is a part of China, you don't have to invade countries just because they have resources, I can't see any country trying to invade Saudi Arabia.