I don't think we'll ever agree on it-the debate between personal choice and public good has raged on since the founding of our country.
When it comes to vaccinations, I think as long as the herd immunity is kept at eradication levels it's not an issue to allow parents to decide. However, so much misinformation has been spread about vaccinations, and so many people have bought into the misinformation that we've allowed measles to make a resurgence. At this point it's time to tighten the requirements so it doesn't become an epidemic.
I also think that a lot of childbearing age people have never lived through a real outbreak of a childhood disease and don't understand the devastation it can wreak. I well remember polio and how it kept our school closed for a couple weeks somewhere around 8th or 9th grade. We were ok on the farm, but kids in town were sequestered inside their homes for a couple weeks at a time to avoid the disease. I well remember kids coming to school with leg braces, and a couple of them dying from polio. I also remember what a blessing the polio vaccine was to parents everywhere-there was never any talk of not getting kids vaccinated.
We have friends that are a younger couple with three kids (10, 8 and 5 if I remember correctly). They elected not to vaccinate their home schooled kids based on some science that has been proven wrong several times, yet she continues to believe that vaccines are somehow very bad. Again, they are young enough not to have experienced a devastating, deadly outbreak.