I would not intrervien in either. Im not sure the sceneros you suggest could happen. Both suggest that you have stopped to talk to them. so #2 couldnt happen as far as "you overheard". If you did only overheard you wouldnt know that they were recent certifides. #1 is not an uncommon situation. solo without a pony or isolated doubles. #2 may be ones first exposure to low visibility with fer of seperation, and the other says just stick with me. I think that if anyone approached me I would wonder who they were and to show me thier scubapolice badge or move on. You cant save people from themselves. Some just resent people butting in.
Yeah, it was more of an ethical thought experiment than a legal deposition about a specific case. The point is that for this made up scenario, you answer as it is presented.
My point is that solo diving has this reputation as being an extremely dangerous type of diving, yet very common scenarios that we see people doing every day are possibly far more dangerous (like #2). I mean, most open water instructors that you see are not only solo diving without a redundant gas supply or solo card, but solo diving with someone who might increase their potential risk.
Yes, there are situations where a buddy can make a big difference, but those are less common in no-stop, no-overhead, low-entanglement-risk, relatively shallow dives. At that point, you need to realistically assess (1) the chance of catastrophic gas loss or severe entanglement, (2) the solo diver's ability to deal with either of those events, and (3) the risk posed by an inexperienced buddy.
So if your reason for intervening with a solo diver is that he or she was about to do something that you considered incredibly dangerous, and you couldn't live with yourself if you didn't try to stop them, then why wouldn't you have the same reaction to a far more dangerous situation?
---------- Post added July 8th, 2014 at 07:48 AM ----------
I think you misunderstood the Godwin's Law reference.
No one's calling you a Nazi, they're just pointing out that not telling someone they broke a property owner's rule is NOTHING like not intervening to prevent a child from being sexually assaulted. It's the internet's way of saying that they don't appreciate hyperbolic comparisons.
What Brandon said.