Probably because he comes into close contact with thousands of people a day and doesn’t want to become the next Typhoid Mary.
So what you are saying is that an asymptomatc vaccinated person can become infected with the disease, show no symptoms, but infect everyone around him with the disease, both vaccinated and unvaccinated?
You just made the argument that NOBODY should take the jab. We are creating an army of Covid Marys.