The silence indeed is remarkable. If we consider a pilots error the clean cut off of the tailboom does not fit into this picture. The fact that Airbus seems totally relaxed shows that most probably there is no problem caused by the design of the h/c, nor by material fatigue. The (only) explanation remaining which makes sense is a connection between the accident and the maintenance which was done some weeks before the crash. Where a missing good torque of the bolts of the airframe - tailboom junction could perfectly explain the clean cut of the tailboom, too. Taking all this together with a far eastern mentality where an individual never does something wrong you'll maybe find the reason for the silence.