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Why Is 'Herd Immunity' Suddenly a Good Thing?

In the early days of the pandemic, there was an idea being thrown around that we should attempt to reach “herd immunity” as soon as possible. It was a terrible, horrible, no-good, very bad idea, because it amounted to giving up and letting millions of people die. And yet, now that we have a vaccine, herd immunity is suddenly a good thing. What gives?