Right, this is what I'm getting at. Bullying people and treating them like shit will not help them self-reflect and change. To achieve that, we need to extend that support you mentioned, we need to somehow see the kernel of personal humanity within them.
Like you said, this isn't a problem where the consequences are confined to individuals, adults acting poorly is causing innocent children to suffer and die, so we need to focus on solutions. This isn't like these people believe in Flat Earth, if we just sit around mocking and belittling these people, more innocents will die at faster rates.
We need to collectively swallow our (totally justified) anger and find some kind of a way to understand the root reason of why people are anti-vaxx, and help them resolve whatever broken logic or unresolved emotional issues is standing in the way of them doing the right thing.