The first time I questioned vaccinations was before it was cool. My daughter's class had a Whooping Cough outbreak, the media blamed it on the unvaccinated kids.

However there were 8 confirmed cases, 4 kids were vaccinated and 4 were not.

This was 20+ years ago. So, while health decisions should remain private, and I don't hold a strong opinion on other people's healthcare decisions, they certainly don't work the way people have been lead to believe.