Laws requiring people to be vaccinated if they are going to be in places where they could infect other people are restricting one kind of freedom in order to protect the freedom of others to go about their business safely. Car crash survivors who were injured because they were not wearing seat belts recognize and regret their irrationality – but only when it is too late. We are now seeing a very similar situation with vaccination ...too many people make decisions that they later regret. They cry. And they say they didn't know. By Peter Singer.