This topic (the persistence of ignorance re vaccines) is a great microcosm for how the internet age has not panned out at all like we had hoped (like a great liberator for thought and knowledge).
We thought that, with everyone now having access to limitless knowledge and facts, our citizens and voters would become more informed than they were before when they most received limitd information through agenda setters in the media. It turned out the exact opposite, as citizens' personal consumption of information abandoned all the best practices of mass media consumption, and people just chose to seek out information that confirmed what is easiest or most convenient to believe. So, even if we're less uninformed that years past perhaps, we're definitely more misinformed than ever before. So, with vaccines, we were effectively smarter when we knew less and before we realized that stupid people thinking for themselves is often just stupid people outsourcing their thought to other stupid people.
Frankly, it's a win for paternalists the world over, and a giant drop kick in the balls to anti-paternalistic libertarians like myself.