It is not always obvious whether a rope is static or dynamic just by feel or appearance. The facts should come out during the investigation. Hopefully it will teach other people a lesson that will save their lives.
Erden if it is possible for you to obtain counciling, it would be good for you, just as it would for anyone who has gone through such a traumatic event.
Unfortunately it is impossible to climb with zero risk. Maybe that is one of the reasons we are attracted to climbing in the first place.