International audienceScience has an enormous influence over many social issues today. This article examines the role we attribute to scientists’ contributions to these debates. We will re-examine the question of objectivity as an ideal and that, more controversial, of responsibility. Our exploration of these matters will be fuelled by a discussion of literary texts and historial facts, and, more particularly, we will endeavour to decipher reactions in the wake of natural catastrophes, which, as the recent Aquila trial has shown, are not without ambiguity..La science a aujourd’hui un impact majeur sur beaucoup de grandes questions de société. Nous nous interrogerons sur la place que nous accordons à la parole du scientifique. Pour cela, nou...