Photo illustration: Alex Hogan/STAT; Source photo: AFP via Getty One day last August, as they struggled to figure out whether to lift Covid-19 restrictions, the supervisors of Placer County, California, convened a panel of experts. It was a reasonable move. If being a local official could be thankless in normal times, the pandemic had made it nearly impossible. Federal messaging had been hopelessly muddled. Rules meant to stop viral spread came with painful side effects. One constituent insisted the sheriff enforce lockdowns; another called stay-at-home-orders an economic death sentence. Wan...