The use of robots to assist people presents a wide range of potential benefits. Specifically, therapeutic robots can provide assistance in companionship, education, and health-care domains. However, there are also costs and a potential for harm associated with this prospect. A significant risk of therapeutic robots is that the use of a robot could reduce the amount of human contact a user might receive. This is particularly troubling for populations at risk for social isolation, such as the elderly in nursing homes and children with developmental disorders, two of the most widely-studied populations for robot-assisted therapies. We examine the use of robots to augment rather than replace humans in therapeutic settings.