You don't have to care about the people who aren't interested in science. Sure, you have to protect immunocompromised people from those people, and we can do that.
"vapor trails" - well, if helps you sleep better.
Not saying this about parent, but am absolutely saying it about the vaccine skeptic community in general.
If the barrier to asking a question is zero (i.e. someone without a high school biology education can ask a question and be listened to) but the barrier to answering any question to the community's satisfaction is high (i.e. a full study, on exactly that question, controlled for all variables, that shows a clear result) then the effort asymmetry leads to many unanswered questions.
... which the skeptic community then points to to support the belief that there are many legitimate unanswered questions.