A recent report by the Australian Defence Force arrived at a conclusion that further investigation was not warranted of commanders regarding their responsibility for failing to investigate suspicious behaviour of subordinates in Afghanistan, who were accused of violations of international humanitarian law. This troubling conclusion calls for a better analysis and understanding of command responsibility in international law and gaps in the law of command responsibility. This article identifies the conflicting precedents and scholarship regarding the law of command responsibility, which create uncertainty, and proposes a clarification of that law, with a special focus on the “reason to know” standard that triggers responsibility for failing to prevent or punish war crimes. It refutes the popular claim that commanders must act wilfully, and it rejects the common dichotomy between a commander who orders or otherwise directly participates in the war crimes of subordinates and one who unwittingly fails to prevent or punish such crimes. Using the empirical psychological literature, the article further explains how commanders can insidiously signal toleration of war crimes without giving direct orders. Finally, the article argues that international law, by absolving commanders who fail to properly train their subordinates to respect the law of armed conflict, misses a rare opportunity to deter war crimes, and offers some suggestions to fill this gap in the law.

According to the conventional view, causal and moral responsibility have a strict hierarchical relationship. Determining causal responsibility comes first; then we sort through the factors to which we have assigned causal responsibility and determine which, if any, should be assigned moral responsibility too. Moral inquiry accordingly stands not only apart but also above causal inquiry. But I am going to argue that this way of looking at causal and moral responsibility is a mistake. Rather than being separate and independent inquires with different purposes and concerns, I am going to argue that finding causal responsibility actually entails finding moral responsibility even when there is no evidence of what we would call traditional fault. Indeed, I am going to argue we cannot find someone causally responsible without finding them morally responsible too.