On the Consistency Rule in Causal Inference

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Abstract
In 2 recent communications, Cole and Frangakis (Epidemiology. 2009; 20: 3-5) and VanderWeele (Epidemiology. 2009;20: 880-883) conclude that the consistency rule used in causal inference is an assumption that precludes any side-effects of treatment/exposure on the outcomes of interest. They further develop auxiliary notation to make this assumption formal and explicit. I argue that the consistency rule is a theorem in the logic of counterfactuals and need not be altered. Instead, warnings of potential side-effects should be embodied in standard modeling practices that make causal assumptions explicit and transparent.