In the past two weeks, COVID-19 has struck three well-known people. Former Secretary of State Colin Powell, who had been fully vaccinated, died on Monday due to complications from the virus. Meanwhile, two men who had refused vaccination—conservative radio talk show host Dennis Prager and Texas gubernatorial candidate Allen West—caught the virus but survived. On Fox News, these stories are being exploited to cast doubt on COVID vaccines and to suggest that people should rely instead on “natural immunity” or therapeutic drugs. But in fact, the three stories illustrate how vaccine refusers endanger everyone else. People like Prager and West...