My point is that even if a disease is not dangerous to everyone it is worth to vaccinate everyone so that the rest benefits from herd immunity. In the cases whe

My point is that even if a disease is not dangerous to everyone it is worth to vaccinate everyone so that the rest benefits from herd immunity. In the cases where a disease is not dangerous to most children but dangerous to most adults things are even more complicated because once you have vaccinated sufficiently many people the disease becomes rare so it is more likely that someone unvaccinated contracts it as an adult.