And there are so uncomfortable truths around the vaccines.
I don't think they're uncomfortable enough for people to not take up the offer and genuine anti-vaxxers to me are insane, but they are there.
Indeed, but you engage based on the understanding that not every 'anti-vaxxer' is insane. All you can do is calmly and rationally explain the benefits of the vaccine and how they definitively outweigh the downsides. What we shouldn't do is just pretend there are no downsides.