Humanitarians are required to be impartial, independent, professionally competent and focused only on preventing and alleviating human suffering. It can be hard living up to these principles when others do not share them, while persuading political and military authorities and non-state actors to let an agency assist on the ground requires savvy ethical skills. Getting first to a conflict or natural catastrophe is only the beginning, as aid workers are usually and immediately presented with practical and moral questions about what to do next. For example, when does working closely with a...