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.
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.