Yelling that correlation is not causation 1000 times is ignorant when the effectiveness of a method depends only on correlation, and does not depend on the exis

Yelling that correlation is not causation 1000 times is ignorant when the effectiveness of a method depends only on correlation, and does not depend on the existence of a causal link. And in the case of filtering, that is the case. Think screening for a virus vs trying to cure the virus. If warts are a symptom of the virus, having warts absolutely matters in screening. However, cutting off the warts will not remove the virus.