The power of vaccines is three-fold: it prepares your body to fight with a virus/bacteria, it protects others that cannot be vaccinated and, at groups or population level, it blocks the spreading of diseases. Herd immunity is the situation where an entire population is vaccinated and therefore all are protected since there is no way or host that would transmit the disease. Unvaccinated people inside a group pose risks to other even if they are vaccinated. Since vaccines are not 100% successful that means that some might get the disease.
Vaccinate, people, and don’t let kids or elderly die because you refuse to vaccinate.