At the age of 17, Kamaltürk Yalqun was one of several students chosen to help carry the Olympic flame ahead of China’s 2008 Summer Games in Beijing. Today, he is an activist in the United States calling for a boycott of the upcoming Winter Games over China’s treatment of his Turkic Muslim Uyghur community. “It seems to me that our sense of global citizenship and sportsmanship is not moving forward with these Olympic Games anymore,” Yalqun said in a phone interview from Boston, where he now lives in exile. In the years since he took part in the Olympic torch relay and later attended the Games a…