 The common good, however, points to a different kind of defect in a private society. The defect in this case extends to all forms of private society, not just to a society of rational egoists, and the defect is noninstrumental. The defect in this case is that the members of a political community have a relational obligation to care about their common affairs, so the fact that they are exclusively concerned with their private lives is itself a moral defect in the community, whether or not this pattern of concern leads to a suboptimal outcome.