The potential of international criminal trials to express the wrongfulness of mass atrocities and instil norms of appropriate behaviour within communities has been subject to a lively theoretical debate. This article makes an important empirical contribution by examining the limitations to the expressivist aspiration of international criminal justice in the context of the message communicated by the International Criminal Court’s Office of the Prosecutor (ICC-OTP) in the Ongwen case. A detailed analysis of the selection of charges, modes of liability, and the overall presentation of the Prosecutor’s arguments at trial suggests that the ICC-OTP’s limited capabilities to apprehend suspects and its dependency on state co-operation risk the excessive stigmatization of the few defendants available for trial for the purpose of demonstrating the Court’s capability of prosecuting notorious criminals. As the only apprehended commander from the Lord’s Resistance Army (LRA), Dominic Ongwen has been presented by the ICC-OTP as the ‘cause’ of crimes committed in Northern Uganda without due regard for the degree of his alleged involvement in those crimes compared to other LRA commanders, the role of other actors in the conflict, or the significance of his own victimization as a child. Ongwen’s excessive stigmatization expressed the importance of the Ugandan investigation after a decade of showing no results. Yet, it also produced a simplistic narrative which failed to express the complexity of violence in Northern Uganda.