We know the old vaccines work, but we don't really know their long-term side effects.

And the way to find out is from what RFKj said: we need herd immunity to protect unvaccinated people so more normal people choose to skip vaccination.

If it's just the crazies that don't get their kids vaccinated then any result is heavily selection biased. Ideally we would assign kids randomly to not get a particular vaccine or any vaccines, and the only way most parents would go along with that is if enough others are vaccinated that they feel their kids will be protected.

We know the old vaccine work, but we don't really know their long-term side effects.

And the way to find out is from RFKj said: we need herd immunity to protect unvaccinated people so more normal people choose to skip vaccination.

If it's just the crazies that don't get their kids vaccinated then any result is heavily selection biased. Ideally we would assign kids randomly to not get a particular vaccine or any vaccines, and the only way most parents would go along with that is if enough others are vaccinated that they feel their kids will be protected.