Yikes. I guess it takes all kinds.
Yikes, indeed. In a related story I have told before...
Years ago my wife and I were out on a dive boat with another couple and a DM, who will remain nameless because I don't even remember the op, and the DM got really aggressive with his depth on the second dive. My wife and I looked at our computers and decided to stay shallower while the other couple stayed with the DM.
When we got back aboard, the guy of the other couple noticed that I had the same computer as he had borrowed for their trip (an Oceanic puck), and he asked me why his was flashing. I told him that it meant that he had missed a deco stop and the computer would be inoperative for the next 24 hours, and he should probably take it easy for the next few hours and watch for symptoms of DCS.
He argued with me that the computer was just "f'ed up", and as evidence he showed me the (also borrowed) similar computer his wife was wearing, which was also flashing. "See? Hers is f'ed up, too!" He angrily asked me, "What are we supposed to do for computers on our afternoon dives?" I reiterated that they probably shouldn't dive again for a while, but he didn't want to hear it. I started to tell him that they might as well just dive without the computers since they were going to ignore them, anyway, but he was a lot bigger than me. ;^)
I hope they survived their trip.
PS: It might have been the same DM that I once saw send his computer up attached to his SMB before the end of a dive.