The Chinese Communist Party’s defence against charges that it was responsible for the Covid-19 pandemic goes something like this.  The virus didn’t originate in China; or if it did it didn’t come from Wuhan; or if it did it wasn’t from the laboratories of the Wuhan Institute of Virology; or if it was it had nothing to do with military research into biological warfare; or if it had it was never China’s intention to ‘weaponise’ it; or if it was they had, as soon as the first human became infected, taken immediate action to prevent it spreading globally by isolating...