Simulations can provide new ways to study the ethical and legal dimensions of social phenomena. However, their use might itself have ethical or legal consequences, as the outputs of simulations influence decision- and policy-making processes. This activity invites participants to discuss how the simulation design process can become sensitive to ethics and the law: what are the factors that must be examined? What can simulation designers do about ethical and legal demands? Are current design practices well equipped for that purpose? By debating these and other questions, we conclude the Fest with an examination of the broader implications of social simulation.