I don't know, but if something like: >“Don’t get #vaccines. Illuminati are behind it.” is actually given any credibility and can actually contribute to form or shift an opinion, there is then IMHO an underlying (bigger) problem with the gullibility of the people.
Yes, there is, and much of the issue comes from the way our brains work. We have an entire branch of science dedicated to it: psychology. Knowing about it doesn’t mean you can wave a magic wand and fix it though, so you need to attack the problem at every level you can.