The person who would make the decision to not do the dive is the dive instructor who led the dive. That is the person who has the final say because they are the person who is ultimately responsible for the dive. Not the shop owner, or the manager.
If the decision made by an instructor is grossly off base, then yes, asking the dive shop to take ownership of the issue and offer a refund might be appropriate. But when you're talking about advanced dive sites in less than good weather and water conditions, then 'reasonably prudent' will equate to a conservative decision every time if it's me on the boat.
Experienced divers know and understand this.
When a shop states that they will do this or that, they can't force an instructor do to something that the instructor is not comfortable doing. That's the simple truth of the matter, and I think that the other instructors on this board would agree that as the person who will be held legally accountable in the event of an accident, they would rather quit and move on to a different dive shop than make a dive that they are not comfortable with.
EDIT: I also believe that shop owners
count on their instructors to be this way, and to therefore minimize the risk to the business itself.
That choice is made by the instructor irrespective of a customer's opinion of themselves, their buddy, the conditions, the circumstances, etc. If someone is unhappy with the decision that is made, they are welcome to make that option known. However, it is unlikely that being unhappy with a
conservative decision will get much support from the instructor community.
In short:
The dive didn't happen because of the instructors rightful decision.
An experienced diver knows that a shop will promise best effort to get you the dive you want, but they cannot force their (good) instructors to decide against their judgment on the dive site.
IMO the only thing the dive shop could have done differently that would have prevented this thread in the first place would have been to say something along the lines of, "there will be no problem and you can dive as deep as you
and the dive instructor feel comfortable." The shop owners and experienced divers know that this is how it works.
As a disclaimer, I only offer the following as second hand. I'm obviously not fully aware of all of the details of any of these supposed events, but I trust the people who told me of them and I figured that it may help the people taking part in this discussion to have a slightly bigger picture to consider. My apologies to the OP if neither event are true or accurate.
Since I live on Saba and used to work for one of the other dive shops here, I spoke with someone at Saba Divers (the island is tiny and everyone knows everyone) and I was told that the day after the dives, the OP wrote to the dive shop thanking them and the instructor for the dives, stated that he and his son had a great time, and acknowledged the poor weather conditions and extra effort that the dive crew put in to get all three planned dives done that day. (We did have very crappy weather for a couple of weeks around that time.)
What changed? Why the different attitude now? Is this not it's own type of 'classic bait and switch'?
I'm also curious about this statement by the OP:
Padi rules, as best I can tell, permit him to dive deep as long as he is with me, once he turns 12 (he was not permitted at age 10 or 11).
I've heard that one of the other Saba dive shops supposedly knows the OP from last year when the son was 11, and after declining to take the son on a deep dive based on the rules that the OP mentions above, ended up having to give the OP his money back to resolve the resultant upset.
I'm the first to admit that I don't personally handle disappointment well. However, I do make an effort to see where the boundaries are between 'circumstance' and 'fault'. The disappointment of the OP, which apparently didn't surface until after the first 'thank you' email was sent, is completely understandable and requires no justification whatsoever. We're human. We get pissed off at things. However, it doesn't sound like any particular part of the mechanism was really broken. Whatever exchanges that have occurred after the dive trip would seem to be more of an issue of needing to place blame in a situation that is almost entirely a matter of circumstance.
Not to put too fine a point on it, but again: Experienced divers know that in spite of anything else, the dive instructor leading the dive has the final decision. Had the conditions been better, and had the instructor had a different opinion of the junior diver, then they probably would have taken him on the dive. The instructor's opinion is final, and it's based on their interpretation of the circumstances.