Vaccine mandates didn't make people like RFK anti-vax, they were already anti-vax because it's an ideology for them.

I doubt he believes it. Rather, it is a platform he adopted for political power/relevance. After hearing his explanation of Russia invading Ukraine to "defend itself", I don't believe he is participating honestly.

You must be talking about the long-gone Supreme Court of 120 years ago, conservative as hell itself, that ruled in favor of vaccine mandates over whimsically inspired avoidable tragic waves of death. The 7-2 majority decision ruled that vaccine mandates were allowed as a legitimate police power of the states.

Hell, George Washington mandated smallpox inoculation during the Revolution.

Herd immunity?

That is an essential concept. Consider the Salk polio vaccine: before the results of the conclusive trials were announced, it was speculated that if the vaccine was 25% effective, everyone would want to have their kids vaccinated. The results came back at around 85%, and the acceptance of the vaccine was high and, because of herd immunity, it reduced the incidence of polio by approximately 99.9%. Further techniques, such as switching back and forth between live virus and dead virus vaccines at multi-year intervals, boosted the effectiveness to observationally 100% when compliance was very high.

"Oh it's their fault I believe conspiracy theories. If they didn't want me to believe fringe things they should have believe the fringe things themselves"

The only people to blame here are those peddling the conspiracy theories.

I sort of love the idea you present that maybe some conservative moderate pro-vaccine people are going to get screwed and maybe die of contagious diseases, and it’s somehow the fault of a bunch of people on the left. That this is a binary zero-sum game where either everyone gets forced to take a bunch of dangerous vaccines or no one gets any vaccines, and that the moral imperative is to promote an extreme ideology that is a reaction to an imagined majority that hold on opposing extreme ideology.