I worked for the Navy in public affairs. Our office published the base newspaper. We would every week print guidance from the safety department: wear seatbelts, don't smoke, watch out for black ice and so on.
It eventually occurred to me that this type of guidance (e.g., get vaxed) doesn't work because the appeal is generally to the rational side of the mind, whereas many people live their lives using the other side of their brain....the side that governs actions emotionally rather than rationally or logically.
You can present every logical argument to a smoker, and they will not quit. The rational side of their brain knows that smoking is illogical and dangerous, but their "will" is not engaged, so they continue to smoke.
When it comes to getting the COVID vaccine, these people hear the rational, logical arguments, but it's not their practice to live according to logic and reason. They hear, but their will, their emotional side, leads them in the other direction or prevents them from doing what the rational side of their brain tells them is the right thing, the smart thing, the correct thing to do.
Most of us follow the science and get vaccinated, but a significant number of people are simply not moved or persuaded by science or logic. They "feel" that they know better.
Human beings are complicated and strange creature.
far fewer people smoke today than when i was a smoker, and i smoked for 23 years. also, most people wear seatbelts today. there are a variety of reasons why this is so (laws, price etc) but you cant tell me that overtime after the initial resistance most rational people have to come to understand that smoking and not buckling up is hazardous to your health