I NEVER said that every parent makes the choice based upon a tragic event...what I said is that not every parent that has chosen the less than traditional path has done so without great amounts of thought and research.
Yes there probably are those that read one or two internet sites and said I'm not doing anything, but IME most parents that have chosen to either selectively vaccinate or not vaccinate at all did so after multiple hours of research (some 20-30 if not more) and countless hours of thought and discussion.
Not everyone agrees about everything. I could pull up study after study that will show pro or con about almost any vaccination topic...even the "experts" aren't in agreement on this.
If they can't agree...there is no way a bunch of WDW aficionados are going to agree about it!
...in regard to the herd immunity thing. Yes, in a perfect world vaccines would be 100% safe and effective, everyone would get them, and we would achieve herd immunity.
Unfortunately, the safety and efficacy of vaccines is what is under debate. There are some data that says vaccines are safe and efficacious, other data disagree (see above where I point out that there are studies that will show either side).
Some parents have decided that the safe and efficacious data are correct and others believe the data that says vaccines aren't safe and efficacious.
If you are a parent that believes they are safe, then you want herd immunity. You believe that the vaccine will protect your child and want every child around you to assist in that protection.
Unfortunately, those parents that don't believe that vaccines are safe and efficacious (again, pointing out that data are available supporting BOTH sides) are making their decision to protect their child. Yes, I understand that by them protecting their child it messes up the other parent's sphere of protection...but this is what they TRULY believe....and really, you aren't going to find a parent that is altruistic enough to place their child in harms way (again they TRULY believe it is dangerous), just to protect someone else's child.
It just isn't going to happen.
Here is an example. If I told you that by placing YOUR child on the train tracks every day for 30 minutes was going to save the lives of people in your neighborhood... would you do it?
What if I changed that to may or may not save people?
Would you do your research, find out why placing your child on the train tracks would protect everyone? Would you look up all the train schedules so you could find the 30min window when no trains were planning to be there?
Or would you maybe do the research, find it flawed, then look at the person like they were a four headed octopus from space and tell them they were nuts and no way were you letting your child on the train tracks?
Yes I understand that it is a clumsy analogy but it is essentially that these parents truly believe that the vaccines could be just as dangerous as standing on the train tracks. It doesn't matter what YOU believe to be true, or what the CDC or AAP is saying, that is what these parents believe, so they aren't going to change their minds and put their kids on the tracks.
So we are at an impasse.
Everyone is doing what they believe is the right thing.