Tibet was a sovereign nation roughly 50 years ago. It isn't now. 50 years is someones lifetime.
East Prussia has been consolidated for 130 years now. Not someones lifetime.
Simple eh? And I don't know how many east prussians or southern dutch are demanding freedom for their nation.
As for facts, well your right, I couldn't find a none biased source that hit the three million mark.
However I did find at the University of Virginia a piece stating that more than 1.5 million have been killed.
http://www.virginia.edu/nobel/laureates/bi...ailama_bio.html
Maybe not 3 million, but 1.5 million isn't exactley a handful now is it?