Perhaps more importantly, it needs to be understood that anti-vaxxers are A) freeloading on the herd immunity created and maintained by the smarter people, and B) are directly endangering the set of people who cannot get vaccinated for medical reasons -- they are literally a death threat to many.
Much of this is also people falling for weaponized Russian dezinformatsiya, a very cheap way to both sow discontent, conflict, and illness in their adversaries [3].
[1] https://en.wikipedia.org/wiki/Andrew_Wakefield [2] https://www.webmd.com/children/vaccines/news/20190304/larges... [3] https://foreignpolicy.com/2019/04/09/in-the-united-states-ru...
There are plenty of further resources on all of these topics; this is merely a start