It’s no different than if you fed your children say, mercury, and then claimed you believed it was helpful because of Facebook gurus or similarly unaccredited sources.
I totally agree that children should be vaccinated.
But I just want to point out that there is a difference between actively doing something to harm your kid, and passively not doing something to protect your kid.
Lack of protection is not equivalent to active harm.
Parents should still be required to vaccinate their kids.