There are certainly valid issues here, but I doubt that the protests are doing Tibet, China, or the Olympics any good whatsoever. Imagine if all that energy were directed in constructive channels.
NPR: Tibet Protests Stir Chinese Nationalism
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All Things Considered, April 18, 2008 · Internet death threats and attacks on property greeted at least one person’s efforts to mediate between protesters on opposite sides of the China-Tibet issue. The official Xinhua News Agency is urging Chinese to harness their nationalistic fervor for constructive ends.