Vaccinated people can still get infected and transmit the virus to others, with or without mutations. The idea that vaccinated people are ‘safe to be around’ is an outdated fantasy.
I never said it stopped all transmission, but it will stop a large fraction of it. We're playing games of probability. Anybody that deals in absolutes is living in a fantasy world.
The theory of vaccinating people to protect others is taking another hit.
It looks more that we should focus on proposing the vaccine to the people at risk (clearly identified, >65 years old, or multiple co-morbidity) for their own survival