The vaccinated while currently infected with the SARS COV-2 virus spread it just as easily as any one else. Symptoms or not, the vaccinated get the disease and THINK they are protected b/c they're vaccinated.

What happens is the vaccinated aren't monitored and are emboldened to go to places they wouldn't otherwise go previously.

In reality, this is endemic. We're all going to get it. For the 99.98 percent of people that get the sniffles for a day, catching and getting over the virus is likely a better defense than the vaccine that does nothing to prevent infection nor stop the spread of the individual that is vaccinated.