On April 15, 27-year-old Mei Shilin (梅世林) put up three banners on an overpass outside Chengdu’s Chadianzi Metro Station in China’s southwestern Sichuan province. The banners stated: “There can be no national rejuvenation without political system reform”; “The people do not need a political party with unrestrained power”; and “China does not need anyone to show…