Social media convinces us our small communities are representative of the whole and tells us we’re more right than we really are.
The thing is that I think Musk and many on the right believe their views are majority opinion in no small part because they think the opinions of Black people, women, poor people are invalid and inauthentic. Bigotry is in part about creating a narrow circle of folk who are the only “real” people. Social media may enable that in some ways, but fascism has a core belief that only the in group matters, morally. Musk bought Twitter to specifically to silence those who didn’t agree with him and empower those who did in line with the far right conviction that only certain peoples voices are valuable, and others should be ignored and eliminated.
RFK's anti-immigration stance is about as right wing as it gets! Like 1932 right wing. But his anti-Prozac stance aligns with a growing movement on the left that is anti-meds for mental illness. Here's a NY Times story on an aspect of that:
This is great but I think you might be doing a bit of silo-thinking yourself. I'm a pro-vaccine progressive. But the anti-vaccination folks are not exclusively right-wing. I think the right-wing just happens to be extremely loud about Covid and Covid vaccinations. And, based on what I've read about RFK, Jr., his politics outside of vaccination science are pretty much left of center Democrat. And there are many back-to-earth progressive hippie types who are anti-vaccination. A lot of home-schoolers are anti-vaxx. And home-schoolers come from the religious right and the secular left.