The argument for a lockdown was overwhelming. When Boris Johnson addressed the nation eight weeks ago, it appeared as if a killer virus was about to engulf the population at astonishing speed. You had to be mad or bad, it seemed, not to back the Prime Minister as he urged us all to stay at home, protect the NHS and save lives. The moral justification for collective action was crystal clear. “Squashing the sombrero,” as Johnson colourfully put it, was needed to buy time for the NHS to fight this thing. And we did it. Britain achieved that aim.