Communication, Lying, Immorality

As has been previously discussed, an internally inconsistent signal can be self-defeating, since a response to it is difficult, if not impossible.  In some cases, the inconsistency is not immediate, but reflects prior irregular usage of the signal.  And, in some of those cases, the irregularity is deliberate--Lying.  So, Lying not only deceives an addressee, and  potentially backfires on the Liar, i. e. damages their credibility, but is, further, an abuse of Communication.  Now, insofar as Communication functions as the basis of social cohesion, such abuse can be classified as 'immoral'.  So, it is the immorality of self-defeating communication that Kant attempts, arguably awkwardly, to formalize as the 'contradictoriness' of False Promising.