Scientific conclusions are based on data which means they trend toward greater accuracy with time. The idea that scientists having changed their earlier hypotheses as more data has become available discredits their legitimacy is a fundamental misunderstanding of that concept.

Because the vaccines were developed on an accelerated timeline, researchers were primarily concerned with demonstrating that they were safe and effective at training the human body to fight the virus. Those early clinical trials were not focused on other questions- like whether they prevented viral spread. (Importantly, no one ever said they did not do that- only that there was not enough data to conclude that they did. There’s a huge difference there.) As time has gone on and mass vaccinations have provided amounts of data full orders of of magnitude greater than were available in the development stages, the scientific community have studied this question, and are increasingly being led to the conclusion that your vaccination does, in fact, make you statistically less likely to spread the virus to those around you. That means Mom & Dad when you take the kids for a visit, your brother on chemo, or the poor lady bagging your groceries who’s going home to care for her elderly mother. As that becomes a matter of increased consensus, it gets harder to justify skipping the shot on the grounds that you, personally, are in a safer demographic.

And since this is a question of vaccine efficacy, the virus’ origins are not germane. Whether it came from a wet market, a virology lab, demon alien sperm; or was funded by Chinese communists or Anthony Fauci, the vaccine protects you from it just the same.