> The vaccines work, so parents who choose to vaccinate their kids will be protected.
This is false for a number of reasons.
1) Vaccines don't provide perfect protection, breakthrough infections can occur.
2) Some people can not receive vaccinations due to health conditions.
3) Immunocompromised people are not protected by vaccines.
We managed to make it illegal to beat the crap out of your kids even though there are still plenty of Americans who think not beating your kids is harmful to them.