Chinese president Xi Jinping, the country's most powerful leader since Mao, is inflexibly pursuing a policy to eliminate the transmission of COVID-19. Shanghai, population 26 million, is locked down. People are virtual prisoners in their own homes and the lockdowns are crushing the economy. But world health experts say it is impossible to eradicate the highly contagious coronavirus. The Mercatus Center's Weifeng Zhong, who analyzes reams of Chinese state propaganda to discern policy shifts, explains what's behind Xi's fanatical campaign to achieve the impossible.