This article examines the compatibility of law and robotics by comparing robotic and human legal-decision making. In a scenario where a robot and a person make exactly the same legal decision, with the same factual consequences, there would still be an important difference between the robotic and human decision-making processes. People will be able to relate to the human decision-maker, and this capacity shapes the judgement we have over the fairness of the decision and its outcome. Concurrently, we are not able to relate to the robot in the same scenario, and to reproduce the conditions of relatability in the robot is unforeseeable with the current development of cognitive sciences. Our capacity to judge the fairness or unfairness of the actions of others shapes our acceptance of and faith in the legal system. Robots making legal decisions would not recreate the same conditions of trust in the fairness of the legal-system, which is one source of incompatibilities between law and robotics.