America’s recent vaccine news has been good. More than half of U.S. adults have now received at least one dose of a Covid vaccine. In most states, new cases are down or at least not surging. Medical personnel know how to better treat Covid patients, which has kept hospitalizations and deaths to a fraction of their winter highs. It’s starting to feel as if life might approach something like normal as spring rounds the corner into summer. There’s just one big, honking, horrifying question: Will enough Americans roll up their sleeves to end the pandemic, or will too many skip out on getting the shots?