THIS!
Nobody (CDC, Fauchi, etc) ever claimed that getting vaccinated would prevent you from catching it. It’s not a big whole-body condom. All they ever said was that it would protect you from severe illness when you are infected (instead of dying, you only get really really sick, or instead of getting really really sick, you just get mildly sick), because the vaccine gave your body a head start at fighting it off. They did hold out hope that the vaccine would help your body fight it off quickly enough to lower your “viral payload”, so that you didn’t have much virus in you to spread to others. But Delta has gotten around that limitation by being so severely contagious.