Then the logical fallacies took over. Those diseases aren't dangerous anymore. It won't matter if I don't immunize my child, etc. But unfortunately, they are still necessary. No matter how many fear mongers or fake scientists or outright fraudsters argue that they are not safe, they are safe. They are safer than the alternative. After all, not vaccinating is not without a very high level of risk.
Pretty much every word of that has been debunked. I won't bother here in going through it all, but AB 2109 is a good bill from a good Assemblymember, Richard Pan. Pan, who just so happens to actually have training in these matters by virtue of being a medical doctor, understands the public health crisis that unvaccinated children present. The bill would require a letter from a doctor to the school if children skip a vaccination.
This isn't about the state controlling some godlike power. The state has the power to require car seats and seat belts; both of these are a decent analogy for the question of vaccines. This is a collective issue for all Californians. We all gain (or lose) when we have a healthy community.