All ethics of intervention must recognize that there is nothing like “the morality carried by a homogeneous moral community in a given society, especially in contemporary pluralistic societies. This article proposes, firstly, that the complexity of the analysis in ethics of social interventions derives from the existence of a plurality of “moralities” (e.g. religious, institutional, professional, common sense), each of which offering guides for moral action that may conflict. This is highlighted by a political dimension to all ethics: these moralities are carried by social and ethnic groups in asymmetrical relationships of power. Any ethics of the intervention must be aware that the weight of values and moral norms subjected to the arbitration of the intervener depend less on their intrinsic value than on the power of those who promote it. It also depends on the socio-historical process of moralizing lifestyle, sometimes leading to the stigmatization of vulnerable populations and to moral crusades. One of the responsibilities of all ethics is therefore to proceed to a critical analysis of the weight granted to the various moral discourses inscribed in these relations of power within and between each morality. The same applies, in particular, to ethnic moralities and the question of respect for traditions.