I used to be deeply annoyed by the Tony & Cherie Blairs of this world - who seemed not to inoculate their children, hoping that the rest of us would generate enough herd immunity.
It was explained to me by a senior officer with American Special Forces (they have global responsibility on behalf of the US for pandemic control) who holds a Masters in Clinical Psychology from Stanford ('Makes you a more efficient killer) that the issue with vaccine deniers is that they fall into the position that lawyers notice from years of experience of being functioning humans but with a huge gap in the understanding of the world / ability to comprehend concepts. For every person with an IQ of 140, there is someone with 60 = The standard to which airports have to be able to be managed by passengers.
From an evolutionary perspective - think of a group of hominids of the plains of Africa facing a stalking wild cat. The best thing for a group is to let the brightest within the group work out what to do, and have the stupid ones stay quiet and not run out of the group = place themselves at risk. It's why Private Jones in Dad's Army is an unusual character. Faced with a virus (and needing a vaccine) - neither of which the deniers / hesitancy understand - their natural reaction is to deny there is a problem / do nothing try to convince others likewise. Sadly, faced with a (potentially) deadly virus the evolutionary trait bred into humans is exactly the wrong thing to so = It's why Dumb Asses like 'Meatloaf' died of COVID (whatever their other gifts / skills).
