Rain, like the downpours that have inundated Shanghai in recent weeks, doesn’t buoy the spirits. But don’t despair, counseled the People’s Daily, the Chinese Communist Party’s mouthpiece, on Monday: “Rainbows always appear after rains.” That upbeat message coursed through China’s state media on Monday, referring to the dismal performance of the nation’s bourses, including the Shanghai Composite Index, which has lost nearly 30% over the past three weeks. The chief rainbowmaker is, no surprise, the ruling Communist Party.