When Stanford University School of Medicine professor John Ioannidis warned on March 17 that the rush to implement sweeping coronavirus lockdowns could be “a once-in-a-century evidence fiasco,” his was a lone voice amid the rising pandemic panic. Not any longer. As the statistical models on deaths are revised downward and the economic and social costs of the stay-at-home strategy grow more dire, contrarians are diving into the data and asking whether the lockdown pain was worth the gain — or whether the COVID-19 reaction was overblown. “It is now clear that the lockdowns were a major mistake everywhere except the...