Nuance matters here. Vaccines do prevent the spread, it's just not 100%. Are you a Bayesian? If so, using the prior of "vaccines are pretty effective at prev

Nuance matters here. Vaccines do prevent the spread, it's just not 100%. Are you a Bayesian? If so, using the prior of "vaccines are pretty effective at preventing spread" was reasonable until new data came in - this was a brand new technique in a novel virus. Further, the environment changed due to mutations - the fair question is "how effective was the vaccine at preventing the spread of the origin virus?"