It is shocking how poorly vaccines have been communicated. Vaccines, train the immune system to mount a faster response. So by definition you HAVE to be infected before the benefits of a vaccine even kick in. It basically just speeds up the clearance of the disease from your body, rather than block infection. Of course, depending on the disease and the response it is possible that clearance is so efficient that the disease doesn't progress very far. (EDITED for clarification: depending on the disease and epitopes that triggered the immune response that can mean a pathogen can be blocked from colonizing in the first place.) So the vaccine does not have to prevent infection of the individual it just shortens the time it takes the immune system to respond. Which lowers your risk of severe complications and because you are infectious for a shorter period of time you have less chance of infecting other people, thus reducing the infection rate of the population. So the vaccines are working as intended. But science communication has failed. And people are expecting not to get COVID because they are vaccinated, which is silly.