Studies from Israel so far have shown vaccinated people almost never infect others. So wearing a mask vaccinated is not about protecting others, at least not according to our current scientific studies

Studies from the UK have shown that people with one shot, after 3 weeks, still infect others, though the rate is 49% lower.

One shot is therefore not sufficient for herd immunity, apparently, as expected. We need also data for all the various vaccines, and for people who recovered from the infection.