I don't feel that your general condescension is warranted and wish you would reconsider your enhanced question-answering techniques.
I also observe that, an economics-based idea, many people do what will benefit themself. Pose to anyone that, "You're a finance worker so you wouldn't understand the full implication of getting the flu shot," as opposed to, "It is likely to decrease the chance of getting, or the severity and duration of, the flu." ... Win them over, you silver-tongued devil.
I'm of the school of thought that a good end result regardless of intention is leagues better than a bad end result despite good intentions. His vaccination is fine by me, no matter his motivation on this one topic.