Tibet had been a free country until it was overrun by china around 1950s.
It wasn't the case with kashmir (it was added to india & pak from earlier rulers during and after partition with british approval) or assam wherein the local people enjoy all the freedom and democracy(unlike today tibet wherein its more of ethnic cleansing)
And tibet is closer to india where, being a part of china is not good for india.
We cant do a thing about Congo or any other country, but this is something thats of importance to our security and its being truthful to the tibetans as well...
still, india is fearful of china, and it does not have a stand of its own.
we have given asylum to tibetans but we cant take a strong stand against chinese oppresion. thats the fact at the moment...