This article tries to deconstruct a set of hypotheses about the tragic and productive link between identity and alienation, which is inherent in social and political theory and seems insurmountable and unanswerable and thus it moves the axis from hostility to hospitality. This is possible through Jacques Derrida's thought that allows differentiation between concrete and measurable forms of hospitality, as is done in social science and anthropology, and the analysis of the concepts of identity and difference, as this theme could be thought by philosophy that also takes in consideration (where this is precisely impossible) the immensurable and unpredictable.