The aim of this study is to question the epistemological and methodological stakes of ethics intervention. The reflection is anchored in the follow-up of a group of clinical ethics in an adult intensive care unit. The experience we relate here is a report of “a failure” as for the reasons adduced for the clinical ethics as method of intervention. The hypothesis which we support is the necessary interrogation of the approach, in particular in the light of a gap between the ideal of collective deliberation which is important to clinical ethics and the conflictuality in care.