Why wouldn’t someone want a COVID-19 vaccine? Staring at the raw numbers, it doesn’t seem like a hard choice. Thousands of people are dying of COVID-19 every day. Meanwhile, out of the 75,000 people who received a shot in the vaccine trials from Pfizer-BioNTech, Moderna, AstraZeneca, Johnson & Johnson, and Novavax, zero died and none was hospitalized after four weeks. As the United States screams past 500,000 fatalities, the choice between a deadly disease and a shot in the arm might seem like the easiest decision in the world. Or not. One-third of American adults said this month that they don’t want the vaccine or are undecided about whether they’ll get one. That figure has declined in some polls. But it remains disconcertingly high among Republicans, young people, and certain minority populations. In pockets of vaccine hesitancy, the coronavirus could continue to spread, kill, mutate, and escape. That puts all of us at risk.