Before anyone judges the decisions, there is quite a bit of important information missing. Was the nature of the injuries communicated to the controller? Were there other emergencies at the same time? Would an immediate response have made a difference?
Just imagine if the crews jumped to every emergency outside their area of responsibility, conflicting with the people who were supposed to respond, whilst people die in their own area because they weren't where they were supposed to be. That would be a very decisive lawsuit.
It's not as simple as assuming every crew will be able to jump to the first accident they hear of. Procedures, including boundaries, are set up for these events. If they've discovered a flaw in the system here, then the procedures will have to be amended.