This doesn’t sound like a life-saving approach at all. Helps to frame it as the idea, not the person, that’s idiotic. Then work on being a better communicator who’s powerful at getting concepts across.
Maybe stupidity should be ridiculed? We've tried taking it seriously and it isn't helping.
It's irrational to not consider the question of whether taking a vaccine is right (for yourself [or dependents], and for the population).
The point is that society already evaluates these hazards/risks very effectively so that individual parents don't need to. Indeed any individual parent's risk analysis about vaccines is likely to put their children at greater risk.