The thing that everyone is missing is that the French legal system demands this sort of questioning in all types of accident. They are not trying to lay blame .... just establish the complete picture.
This seems a very good point. I have no knowledge of the French legal system but it seems to me they left any inquiry a liitle late to do any good. The tragic accident, incident or whatever you like to call it, happened over 4 years ago. Since then, Concorde was modified at great expense before being retired from service, partly as a result of the Paris crash. It's highly unlikely that one will ever fly again.
There is an "acceptable risk" element with any piece of machinery. Many of us travel in aircraft & other vehicles or drive our own cars with potentionally dangerous faults that have never been rectified despite the manufacturers & authorities being fully aware of them. A certain percentage of serious injury & deaths caused by the product is regarded as acceptable. No company these days would dare accept responsiblity for fear of being sued & possibly made bankrupt.