The Nobel Peace Prize is meant to be awarded for work that has to do with promoting peace between nations. Mr Xiaobo did not perform this type of work. He was addressing China's internal political situation. He should not have been awarded the Nobel Peace Prize. 

FYI: Liu Xiaobo was very much a supporter of the US war in Iraq and US foreign policy in general, and he was a big critic of Islam (some Canadians would likely call him an Islamophobic bigot).

(I'm not saying Mr Xiaobo's criticisms of China are without merit.)