If that person cares about his health, he will still wear a mask and face shield outdoor and it is not about how they should debate about which opinion is right.
Your health is safe once you already take the vaccine, it's about the risk to the people surrounding you that have not taken their vaccine yet, and that is very irresponsible if we are not wearing a mask or people will go in public places without a vaccine. However, since America is a leading country, I'm sure soon everyone will get their vaccine and they are free to roam anywhere without a mask or face shield.
I heard that people already vaccinated can have the virus inside their body, but getting infected will reduce than people who are not vaccinated.
We do not want to risk people around us, especially our family, because they are important to us.
I heard from the news that people who already get vaccinated in the USA increase to 40%, and it will reach 70% before July 14th.
That will good for them. At least, with the vaccinated, they can get protection from the virus.