There is way too much blame being assigned here to a single entity be it a manufacturer or a single system.
The investigation is on-going and damn few facts are available to establish a causal chain. This thread is begining to look amateurish in its over simplification of what went wrong and who is to blame.
The idea that anybody involved with the investigation would not like to find the critical evidence (FDR/CVR etc.) is outlandish and demeans a supposedly professional internet site.
This is not about blame, lawyers or insurrance carriers, it's about finding enough information to prevent a similar accident.
Root cause is hogwash. Nobody can effectively eliminate any system malfunction whether it be pitot tube interactions with computers or a weather radar outage.
Our efforts need to be focused on minimization (of an occurrence) and mitigation (of the resulting hazard) To do this you need data on all the interactions that were at play in this accident including the pilots.
In today's machine you can not take the pilot out of the accident causal chain, yet nobody is even considering the what-ifs in this discussion. Remember for every system failure including the pilots there is a cause effect and that is ultimately how the corrective action will be accomodated.