How do you know what they recognized, maybe they just trusted the pro? No go without the pro, right? Seems like a dissonant theme in this thread, not without obvious irony.
If they recognized the inherent danger, then why did they go?
"Maybe they just trusted the pro?"
Only one person is responsible for your safety and that is you! This is a maxim that I was taught in my OW class. If you weren't then your training was deficient. No ... you don't just put your trust in a "pro" ... many of those people have amazingly little experience. You DO know that you can become a divemaster with as little as 60 dives, and relatively little experience outside of a classroom ... right?
Do you REALLY just put your trust in a person with that much expertise? The DM who led those people in Italy to their deaths had zero ... ZERO ... overhead training. How much did he know about the potential dangers before he took them in there? Obviously, not enough ... or they wouldn't have died.
The irony ... or perhaps tragedy ... is that the majority of divers in the world DO put their trust in someone they never even met before they started their vacation. They know NOTHING about this person, and yet they "just trusted the pro". In scuba diving, that's a great way to end up dead.
Maybe instead you should learn to rely on your own sense of self-preservation. But that would require you to first develop one ... and that starts with the acknowledgement that you're in an environment where ignorance could kill you quick, and maybe you should do something to reduce your level of ignorance rather than relying on a total stranger to keep you safe.
Is it common in other fields to try to rattle fledglings?
In recreational endeavors where ignorance and inattention can kill you quick? Absolutely it's common. Try skydiving or rock climbing sometime. They'll certainly make you aware of how easy inattention can kill you, and why it's important to take responsibility for your own safety. Or do you suppose that a skydiving instructor will tell you that it's OK to just let a "pro" pack your chute for you?
Well, I don't read Italian, and much of that video was within sight of daylight, or in a group with lots of redundant lights and air, or under an air pocket. Hard to tell just how dangerous it was, or is all overhead bad, absent a cert?
Great example of how not understanding the dangers can lead to emphasis on the wrong things. Being within sight of daylight is all well and good until somebody kicks up the bottom to the point where you can't see the daylight anymore. Then ... which way to you go to get out?
What do you suppose killed those people?
... Bob (Grateful Diver)