The CDC putting out notices isn't going to help. That just feeds into the rejection of authority at the heart of it. The only hope is to out-crazy them.
Yes, we'll recruit from the Flat Earth Society, Moon Landing Deniers, Church of Scientology, Climate Change deniers, the Pizza Gaters, the 9/11 Truthers, Fluoridation haters, Shooting Victims are Child Actors group, Chemtrail worriers, Black Helicopter spotters, Blame George Soros fans, Illuminati Be Playin' 4D Chess Club, and every f'ing halfwit in a tinfoil hat.
You’ll never crack the religious people as communities that push this crap isolate people.
Consider for instance practitioners of "psychic surgery." All practitioners of 'psychic surgery' know they are frauds because 'psychic surgery' is sleight of hand. With something like acupuncture or homeopathy, it's certainly plausible that some practitioners believe they are doing something real, but with 'psychic surgery' that form of self-delusion simply isn't a possibility. This demonstrates the existence of frauds who know they're frauds. There's no reason to believe similar personalities aren't operating in any other form of 'alternative medicine'.
Don't waste your time with nuts who've made careers out of being nuts.
Or just outlaw all exemptions except medically necessary and block unimmunized children from attending school.
Or use the scientific method to determine what methods of persuasion have the highest success rates for promoting behavioural changes, such as motivational interviewing?
https://www.bmj.com/content/340/bmj.c1900
https://doi.org/10.1016/S0010-8804(02)80030-1
Or require parents to consult with local public health departments to obtain a waiver, which has significantly reduced vaccine exemptions in some cases?
https://www.sciencemag.org/news/2017/04/can-skeptical-parent...
IIRC some places have tried to tie getting required vaccines to public school enrollment, but that is problematic because solu5ion is at state level and not national.
You have to have a genuine and open dialogue with them in the form of a socratic discussion. See examples of street epistemology to get them to lessen their confidence. The first step to lessening their confidence is to get them to recognize and understand that the methods they are using to recognize true things is unreliable. Often you can't get them to flip positions on it over one discussion, so you have to have multiple discussions taking their ideas seriously and being respectful with them before they can come around.
By presenting evidence, they'll be unconvinced and it will probably trigger the backfire effect and drive them deeper into their dogma. So I agree with what you're saying, street epistemology is like a form of motivational interviewing.
I'll bet that once there's a $50/year bill to remain unvaccinated, 95% of the problem will clear right up. For the remainder, great we've got the extra money to take care of it.