[skrebbel]

You're misreading the GP just so you can be a pedant about it.

GP's post is excellent because it highlights where the irrationality comes from. If you want to convince parents with antivaxx tendencies of anything, don't begin by calling them lazy or having ego issues.

Address their fears, explain how the risk of not vaccinating 1000x higher than any perceived risk vaccination can have.

I'm a parent and my kids go to a hippie school (hippie by Dutch standards, i.e. not very). The school is great but one downside is there's a disproportionate amount of antivaxxers among the parents. They very deeply believe in it, not unlike deeply religious people. I've seen it happen, calling them idiots is only going to light their fire. But reminding people why this entire vaccination thing got started in the first place can truly help sway people who are on the fence. Most young-ish people who grew up in the west have no perception about how terrible these diseases are because nobody around them gets them anymore.

[ethbro]

Friend of a friend stumbled across a more effective method.

Ask antivaxxers "What if anti-vaccine information is fake news planted by Russia to weaken our country?" (Not sure if the geopolitics play in your locale, salt to taste)

Only half-joking. It's surprisingly effective because it plays with their (a) propensity to believe conspiracies, (b) distrust of traditional media, (c) distrust of governments, (d) desire to feel smarter than everyone else.