J.C.
Unfortunately un-vaccinated kids are allowed in public schools, and they do not have to let any O. know. So anyone too young to have been fully vaccinated is put at risk. Now that my children are both old enough to have all their vaccines I can breath a little easier, but there have been cases of babies dieing after being exposed to measles through un-vaccinated children. 90% of people exposed to measles without immunities will get it, and those with week systems, like elderly folks and babies too young to be vaccinated, will get very sick and can die. The reason things like measles and whooping cough are uncommon now is because of vaccines. I respect anyone's right to not vaccinate their child, but they should home school and avoid public parks and the like, because it is not right to put other people's children at risk because of that persons choice. Now that my kids are fully vaccinated I would not worry, but when my boys where younger I think that I would have a right to expect someone to tell me if their child was un-vaccinated, because things like measles can transmit acrossed a room, and is contagious days before any symptoms show. I would probably still let my child play with that child, but I would know to keep a special close eye on any issues.
The ones who say"well my kids are protected so why would I care", that is true once you child is 5 and has gotten all their shots, but before that point the child is not fully protected from many things, they need the second MMR, as well as some others they get around age 5, before they are fully protected. And what about younger siblings who may be exposed through secondary contact?