Moral Foundations Theory [1] asserts that socially conservative people particularly value concepts of sanctity and purity - particularly when associated with their own bodies. Hence vaccine refusal, mask refusal and belief in conspiracy theories during the pandemic, etc.

I've long suspected the RFK jr's role is simply to exploit that for his, and his political owner's, benefit. Thata all. The man has no redeeming qualities.

[1] https://en.wikipedia.org/wiki/Moral_foundations_theory