But beyond that, if I can't trust you to take very basic precaution of vaccinating, can I trust you to take the much more obnoxious precaution of masking up, or the still more inconvenient precaution of social distancing generally? Or quarantining after travel? True, I was using a shorthand heuristic that is almost certainly flawed in the specific. Some people cannot get vaccines.
I haven't done any research on it, so I may be wrong, but I also assume that if you have antibodies to fight off an infectious disease, the disease is statistically more likely to exist in lesser concentrations than in a person who does not have those antibodies, if it exists at all.