Why are excusing the actions of the pathetic crew? Blame the victims? It is 100% the fault of the crew!

He did have a watch - that's how he was able to tell how long they had been lost a sea.

The only thing the couple could have done differently would have been to stay with the group. Aside from that there was really nothing they could do other than just be incredibly lucky and happen upon land or another boat that came up close to them. It's tragic that something like this actually happened but the most unacceptable thing of all is that the diving company that ran the trip didn't even have a name call to make sure everyone was back on board.

Plan the dive - dive the plan.
It's basics, the DM on the boat should have given them a max depth and max dive time

They touch on that when they are arguing. I'm sure it stung when the wife mentioned it to her husband.
-Dad, who's that?
-Oh, that? One of my patients. He'ssick.
-Will he live?
-It's looking grim.

In real life the skipper of the boat, Jack Nairn, was tried for manslaughter but was found not guilty. He claimed he instructed another crew member to carry out the count, so I think the jury maybe felt we wasn't to be directly blamed for their death (I would've then liked to see that crew member held on trial!).
However, his company, Outer Edge Dive, was tried by a civil court. They pled guilty and were fined (although I can't find the amount of the fine). Apparently a senior inspector, Christopher Coxon, reported that the company had previously left other dive sites without a doing a head count. It's outrageous that something so simple and common sense was overlooked multiple times.

Yeah how a roll call did not take place before and after is beyond me. I hoped they got sued by the family for that elementary mistake that cost them their lives.

A roll call would have sufficed even. Even a kindergarten teacher doesn't screw that up.