> The anti-vaxxers think the vaccines will kill them or make them sterile, or something...it is really hard to keep track of what their current theory is. Again, it's a free shot you can get at the pharmacy, the only rational reason for avoiding it is [..]
in one sentence, you admit that you don't understand what knowledge some person is operating with. in the next sentence, you claim to know what is rational for that person to do. if you're using "rational" in the literal sense, then you've leapt to premature conclusions.
and i get it. it's exasperating. there's a bunch of people who don't want to take a vaccine. and from the outside it seems that as more information becomes available to this group, their vocalized reason for avoiding the vaccine changes. they're being dishonest, and that's infuriating!
if this is what you're seeing, it doesn't necessarily mean every individual within that group is shifting their story. some certainly are, but many aren't and the group behavior can be explained by things similar to "evaporative cooling": some people leave the group as a result of new information (new people are still getting vaccinated, every day), and the people left behind are the ones for which the previously dominant argument wasn't their primary reason for not getting the vaccine -- and so the dominant argument of the group then changes.
group dynamics encapsulate way more complexity than just that one effect. and i think it's worth considering. you see that your own individual behavior is way more consistent than the other side's behavior -- and it is. but that's comparing an individual (yourself) to a group (anti-vaxxers). it's apples to oranges. the other individuals aren't seeing your individual behavior. they're seeing your group's behavior. they're seeing the exact same type of inconsistent and contradictory behavior that you're so fed up with.
what's the way out? well, we haven't found it, so it's hard to say for sure. but i think it has to involve empathy: seeing beyond the group, and relating to each other as individuals.