Our brains are absolutely, catastrophically incapable of processing and comparing small probabilities, so generally emotion takes control when deciding if a risk is worth it (this is true even for doctors, judges, and others who should "know better," because they still are operating with human brains despite their training). For the people who fear the vaccine, it's like being scared of flying commercial while still being willing to drive everywhere, despite the fact that flying is much safer per mile, because it doesn't feel that way. I know the vast difference between number of people killed driving and flying, but I can tell you how much more nervous I am when I get on that plane than I was driving to the airport. I wish it were as easy as showing how one probability is so much smaller than another, and then my brain would accept it and act accordingly, but I still have that bit of fear on take-off and landing. I don't know how to help people who fear the vaccine, because yes, there are always risks and risks are scary... it's just that there's a much bigger risk next to it (even when the much bigger risk can also be seen as somewhat small from some perspectives).