The better question is why are so many “conservatives” anti-vax when that used to be the domain of the Green Party and radical leftists like RFK Jr?
I don’t know many conservatives who are anti-vax. I know many who are pro-REAL vaccines, though.
But, then....this is not a vaccine.
It’s an experimental, unproven biological agent. Not even fully FDA approved.
...there are plenty here who are ‘anti COVID vaccine’, but are perfectly fine with others (like polio, smallpox, and so forth). There IS a difference.