It is interesting that it is the older folks that favor vaccines. The reason being, in all likely hood, due to the fact we were routinely vaccinated in school. My mother used to be terrified when polio season came around.
With VERY good reason.
I would venture a guess that EVERY FReeper over 50 knew or had a family member who was killed or paralyzed by polio. In my mother's family two died. In my father's family one was paralyzed for life.