For many progressives, extreme vigilance was in part about opposing Donald Trump. Some of this reaction was born of deeply felt frustration with how he handled the pandemic. It could also be knee-jerk. “If he said, ‘Keep schools open,’ then, well, we’re going to do everything in our power to keep schools closed,” Monica Gandhi, a professor of medicine at UC San Francisco, told me. Gandhi describes herself as “left of left,” but has alienated some of her ideological peers because she has advocated for policies such as reopening schools and establishing a clear timeline for the end of mask mandates. “We went the other way, in an extreme way, against Trump’s politicization,” Gandhi said. Geography and personality may have also contributed to progressives’ caution: Some of the most liberal parts of the country are places where the pandemic hit especially hard, and Hetherington found that the very liberal participants in his survey tended to be the most neurotic. The spring of 2021 is different from the spring of 2020, though. Scientists know a lot more about how COVID-19 spreads—and how it doesn’t. Public-health advice is shifting. But some progressives have not updated their behavior based on the new information. And in their eagerness to protect themselves and others, they may be underestimating other costs. Being extra careful about COVID-19 is (mostly) harmless when it’s limited to wiping down your groceries with Lysol wipes and wearing a mask in places where you’re unlikely to spread the coronavirus, such as on a hiking trail. But vigilance can have unintended consequences when it imposes on other people’s lives. Even as scientific knowledge of COVID-19 has increased, some progressives have continued to embrace policies and behaviors that aren’t supported by evidence, such as banning access to playgrounds, closing beaches, and refusing to reopen schools for in-person learning.