Not sure why so many keep pinging on "dive from a boat it's gonna happen". OP never said that what happened was the problem (at least as I read it). The have repeatedly said that the crew's response was the problem. Personally, I've never dove in SD, and I don't know any of the folks involved. I do know, that if someone makes a mistake (like breaking mooring and not noticing for the better part of 1/2 hour) and isn't willing to admit or learn from that mistake, I would not trust them with my life a second time. The old saying fool me once, shame on you, fool me twice, shame on me comes to mind.
I would imagine fear of lawyers may play into it. Never admit guilt is the lawyers first rule of liability. But I don't care how old and salty you are, if you screwed the pooch, at least graciously accept the suggestions for things you should have been doing anyway (maintaining navigation watch and look out discipline). I mean if you didn't notice the buoys drifting away, how would you notice a diver drifting away, or a diver in trouble and surfacing on another buoy line.
I know divers who won't admit or correct mistakes and under no circumstance would I buddy with them to dive. Same goes for charter captains or DMs who can't or won't admit to being a human being.
That's all I have to say about that.