This is a generous assumption of blame. Sometimes this may be fully justified. At other times the blame might have been shared. The point of the code is that it avoids allocating the blame and signals contrition. 'Whether or not I am fully to blame, I apologize fully.' A relationship is not a court of law. The important point is not retribution but mending the relationship. The best way that would do this is the best way to take. The henpecked husband is the one who always seems to get the blame. When this is exaggerated it becomes a caricature of itself and 'blame' loses its meaning.