[cafard]

An old riddle asks what you call the guy who graduated last in his medical class: doctor, what else?

But anybody licensed to practice has spent a lot more time studying medicine that your average coder or engineer. Among the matters they have studied is the current best understanding of vaccines. It isn't the guy last in his class who's coming up with the recommendations that the others follow. And what's best for you in your narrow little case is very likely most of the time what's best for the "herd".