The vaccine wasn't tested for reducing spread - it was only tested for preventing symptomatic illness. We don't know yet if vaccinated people exposed to covid c

The vaccine wasn't tested for reducing spread - it was only tested for preventing symptomatic illness. We don't know yet if vaccinated people exposed to covid can spread it to others even if they don't get sick. Therefore we base our vaccination protocols on something the vaccine is proven to do, not something it might do hypothetically.