Xi Jinping, China’s president, has not even begun to prepare his people for a war likely to inflict mass casualties and economic pain on all sides. In its 100th year the Communist Party is building its claim to power on prosperity, stability and China’s status in its region and growing role in the world. All that would be jeopardised by an attack whose result, whatever the US Navy says, comes with lots of uncertainty attached, not least over how to govern a rebellious Taiwan. Why would Mr Xi risk it all now, when China could wait until the odds are even better?