Keeping my child away from newborns or infants under 12 months would not be difficult. If my child did not feel well and we had to go out in public, a medical mask (even Disney makes them for kids) would be doing more to help prevent spreading illness than parents whose vaccinated kids are coughing and sneezing everywhere still spreading germs.
Apparently it is socially allowable for your child to contract an illness from another child as long the childs parents play by your rules of allowable choices. The fact that their child could have contracted the illness regardless does not matter? Its strictly about the choices the parent should/could have made, right? Lets say a local karate dojo sends out a flyer to my neighborhood for 50% of lessons. 10 out of 15 parents in my neighborhood have our children take the karate classes together because we all agree with the studies that show learning self defense raises confidence, reduces anxiety and can help prevent being injured in certain situations. The other 5 parents do not sign their kids up because they believe in the studies showing that learning to fight can have negative side affects on a childs psychology. Then, one of the children who took classes gets into a fight and hurts a child who did not take classes. Then, instead of speaking with the child who hurt the other child, we put 100% blame on the parents of the injured childs parents and proceed to bully them for being such bad parents because they chose not to have their kid take some form of self defense and cited the proof that their child would have stood a better chance had they made them take classes with the other kids. Since a majority of the parents agree that the kids should take self defense, they are vindicated in their actions, correct?
This is also true for vaccinated children that still get chickenpox and pass it on. You cant abstractly define the circumstances.