If they choose to not vaccinate their child, fine. But they shouldn’t then expose other people to their children’s infections.

It gets messier when they are communicable before symptoms are showing. But if my Sally and your Bobby were at a party with 10 other kids, and the next day bobby is showing symtoms, and then a week later a binch of kids at the party are as well, then they should be held responsible.

Especially if they had reason to believe Bobby had been exposed to it days prior.

Make your choices, but if your religious choices are that important to you, then account for how that impacts other choices you make, and don’t put other people at risk.