> that anyone vaccinated was immune and couldn't catch it.

Those claims disappeared rapidly when it became clear they offered some protection, and reduced severity, but not immunity.

People seem to be taking a lot more “lessons” from COVID than are realistic or beneficial. Nobody could get everything right. There couldn’t possibly be clear “right” answers, because nobody knew for sure how serious the disease could become as it propagated, evolved, and responded to mitigations. Converging on consistent shared viewpoints, coordinating responses, and working through various solutions to a new threat on that scale was just going to be a mess.