Ethics implies an unconditional duty to the truth, otherwise all social relations and the very meaning of society cease. In fact, if the information we exchange is not true, on the basis of what can we then be together to pursue common goals? In other words, can the construction of a good society ignore the unconditional duty to the truth? Since, as Feyerabend said, "philosophers are great artists in finding wonderful reasons for cruel actions", can there be a right to lie that is symmetrical to the unconditional duty to truth? The clash is between two irreducible reasons: the reason for politics and that of friendship; the reason for duty and that of rights; the reason of the whole society and that of every single person. See: Kant and Constant.