FairPhyllis - re "people often justify their decision not to vaccinate with a statement about having 'researched' their decision, which imo shows a lack of appreciation of how skilled and knowledgeable scientific researchers are, and how difficult it is to acquire that skill"
You clearly believe that nobody who is not a medical professional can possibly understand the issues involved, but this is not about a terribly complicated question. It is quite simple to understand.
Mass vaccination of babies for childhood illnesses is sensible for certain dangerous illnesses, but is not beneficial to these babies themselves. It is for the greater good, perhaps, but there are ethical issues involved there and parents are perfectly within their rights to refuse these.
I gave Rubella as an example. It is a very mild disease. If the population were left unvaccinated, everyone would have it as a child and have lifelong immunity. Girls of childbearing age can be tested for immunity and those who are not immune can then be vaccinated. This is what I intend to do for DD.
DS is not vaccinated against Rubella for the simple reason that he doesn't need to be. I'm pretty sure that he has had it as a baby, but even if he is not immune, that is perfectly fine because I don't expect him to be pregnant at any point in his life.
All this is perfectly logical and yet vaccinating babies for Rubella is government policy. Why? Because they have other concerns (herd immunity, protecting the the baby of irresponsible pregnant women who didn't check their immunity, preventing economic loss from parents staying home to care for sick children etc) whereas as a parents I have one single overriding concern (what is in the best interests of my child?).
When you have a minute, look up Game Theory studies of vaccination decisions. GT works very well in this situation because it recognises the different and potentially conflicting goals of the state and the individual and concludes that it is perfectly normal for parents to decide not to vaccinate where perceived risk of a vaccine is higher than its expected benefit.
All this to show you that many people who have decided not to accept the full vaccination schedule for their children are not "whack jobs".