It is true that the far-right has become anti-elite in the last 20-30 years, which includes hostility to science. But another significant part of the anti-vax movement on the right is the government compulsion angle.Yeah, anti-vaxxing has been a thing on both far right and far left for a while, for different reasons. The far left doesn't trust corporate power; the far right doesn't trust science.
RFK comes from the left-side, which is why he also talks about Big Agribusiness etc., but the two visions wrap around.
I've always thought of it as: Hippies/yoga moms don't trust Big Pharma, and MAGAs don't trust Big Government -- leading to the new unholy union of MAGA yoga moms.