(I just translated my last toot -- didn't realize you knew English.)
Even if someone is vaccinated, they should continue to wear a mask and socially distance and take all the precautions. The goal is to do everything possible to fight it and get the infection rate way down to almost zero. Then you CAN open up once the infection rate is down and then do lots of testing and if there are outbreaks, then do contact tracing and maybe additional measures only where the outbreaks are.
But you need to get the infection rate near zero first before opening up. That's the way to do it.