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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.

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