Different political, economic, social and environmental factors are considered in plans for coastline reconstruction following tsunami events. These competing factors inevitably result in a compromise being made with respect to reconstruction policy and practice. Coastline reconstruction may also be constrained by availability of technology, speed of action or decision-making, local political expediency, and external influences such as disaster relief policy and the roles of NGOs. In some cases, it could be argued that such compromises result in inappropriate actions or decisions being taken that do not always consider the dynamics of coastal processes. An outcome is that expensive geoengineering structures may hinder long-term coastline recovery, and may result in future increased coastline vulnerability. Here, based on examples of the 2004 Indian Ocean and 2011 Tōhoku-oki tsunamis, we argue that inappropriate reconstruction after such events may have serious long-term negative effects that can contribute to increased future risk for inhabitants of tsunami-prone coastlines.