The situation you describe is similar wherever there are caves.
Now, if the authorities set a rule for cave entry by the general public on public land (i.e. "NO OW DIVERS...), then , particularly where a minor is involved, the authority has a duty to enforce the rule when it becomes aware of the breach (i.e. by a fellow diver reporting the breach, for example) where there is a danger to the general public (i.e. a minor and/or fellow divers).
This creates the opportunity for a "Cave Organization" to create a "license" system as I described in prior posts, preferably with prior discussion/involvement with the authorities, to facilitate the carrying out of the activity (cave diving) in a safer and better organised manner and for the protection of the cave (i.e. within the Charter/Scope of the Cave Organization).
Once the system is in place, it fosters a culture of not diving in the cave without the "license" and displaying the "license" (at least when asked)... and it is easier for the complying members to identify and reporting the Spiveys (there will continue to be Spiveys same as in hunting there continues to be poachers unlawfully killing and stealing "game").
People will continue to dive and die in caves (maybe the rebreather kills them and it has nothing to do with their lack of training or the cave, or it is just human error on that particular bad day), but if the Cave Organizations feel, as they do, that there should be NO SPIVEYS IN THE CAVE, and the authorities feel, as they do, that there should be NO OW DIVERS IN THE CAVE, then with a working and effective system people will not die for lack of cave training (or to the very least there will be less untrained divers in the cave damaging the cave).
Off to catch a plane for one week of rebreather cave diving (fingers crossed!).