> In practice, this is always what so-called anti-vaxxers believe. None of them actually oppose the concept of vaccines out of some kind of ideological principle. It's always specific concerns about actual, specific vaccines that exist in the real world.
That's being extremely generous, many people with anti-vax beliefs have not arrived there through careful, rational consideration of anything specific.
The risk analysis is no better or worse than it is for other loosely/weakly understood technology such as flying.
It amounts to noticing that few if any of the people you know or are acquainted with through two or three removals from personal contact, have suffered or died as a result of using said technology, and basing your own confidence solely on this privileged form of hearsay.
It sounds like something that should not work, but actually does a pretty good job as a high-pass filter for safety.
That's being extremely generous, many people with anti-vax beliefs have not arrived there through careful, rational consideration of anything specific.