I wouldn’t base history on what TV anchors were saying. The primary focus of the vaccines as stated by their developers was protecting the vaccinated individual. Initial data showed them to also be very effective at reducing transmission- which was encouraging, and became built into the strategy for a lot of people. The Delta variant is now showing itself to be more resilient against current vaccines. They still reduce spread, but not as effectively as against earlier variants; so the strategy is starting to look more like it did initially. (I.e., mask up & vaccinate as many as possible.) What people are interpreting as “flip-flopping” is actually just a response to the reality of a mutating virus. It’s not history being rewritten, but the present in real time.