It is also the definition of rationality… I would go so far to say, if my own interests were not advanced by being vaccinated, I would not have done so. But it is my non-expert opinion that being vaccinated provides significant personal protection from life-threatening disease. It is also my opinion that being personally vaccinated provides marginal protection against the spread of life-threatening disease to people around me, who I have a personal interest in seeing as healthy. Furthermore it is my opinion that being personally vaccinated contributes in a small way to the resilience of my community, nation, and the human race - each of which I have a personal interest in, economically and psychologically.
It is my opinion that the benefits of becoming personally vaccinated outweigh the costs, but I make a point of this: the conclusion is not forgone. In different circumstances, I might be against vaccination; in different circumstances, I would go so far as to say vaccination is irrational.
For example, if vaccines were not free but were prohibitively expensive, it would be irrational for me to obtain one. For me personally, considering my financial situation and my limited understanding of the risks I might draw a line at $800.00.
Or another example, if the prevailing opinion among people I know is that a vaccine is unsafe, I would ask my doctor (who I trust as an authority in the sphere of healthcare). If for some reason my trusted doctor advised me the vaccine was too dangerous to me personally, but the government and media says it is safe, I might seek a second opinion. If the second doc were to advise me against getting the vaccine, it would be irrational of me to get vaccinated. Case-in-point, a person with a history of egg induced anaphylaxis and certain flu vaccines. Our doctor (at my workplace) has in the past advised such people against recieving certain flu vaccines, and recommended an alternate that does not use the egg protein. We presently field patients who claim to have PEG allergies and are concerned about the Pfizer-BioTech vaccine, although the next step is to order allergy testing, and I don’t think we have had any who came back positive. If they had, I’m sure the Moderna vaccine would be recommended as an alternative.
Now put two-and-two together. If I thought I had a PEG allergy (perhaps on advice of a doctor for a reaction to some drug in the past), and the cost of seeing these doctors and being tested exceeds $800, then all other things equal, it would be irrational of me to get the Pfizer-BioTech vaccine.