I think maryeliza's point that having a system in place that covers every eventuality being nigh on impossible is a valid point. There is always something a system won't have predicted and accounted for. I think me's true point is simply that not all tragedies can be avoided however hard we try.
If the current system is found to be wanting in ways that can be remedied, such as having two numbers to call, then efforts should be made to apply that remedy. I've always been asked for two numbers. Before mobile phones were common, you gave one or more work numbers and/or the number of a friend whose permission one had sought. The last was mainly about having someone who could collect your child from school though.
Water Pollution -“ A National Disgrace”? A case for renationalisation?