I liked Andy's post a lot. It echoed the thoughts I had about the role of everyone else surrounding the start of an event. I want to give two examples to illustrate what I believe is a very common issue in almost all areas of life.
When I was a teen, my Boy Scout troop took a trip to a site that included a swimming area with a cliff on one side. Swimmers would climb up to various ledges and jump off. On occasion, we would see some hearty soul take a path around the back to the very top and take the crazy leap from that height. I wanted to see what it looked like from up there, so I climbed the path, looked over the edge, and saw that terrifying view of the swimming hole so far below. I was just about to turn and leave when I heard the shout. I had been spotted. My fellow Boy Scouts were pointing up at me and calling out for others to see that I was about to jump. Soon all eyes were on me. How could I walk away now? I went to the edge, looked back over my shoulder so I would not see down, and leaped out. I was in stark terror all the way to the water. Once in the water, I was swarmed by those congratulating me and, of course, urging me to do it again. I ended up doing the leap 8 times that day, and I was just as terrified on the 8th as I had been on the first. There was, however, no way I had the personal courage to stop the jumps and disappoint my fans.
A biography of of Jim Morrison, lead singer of the Doors, showed a far more pathetic version of the same issue. He arrived at a dinner party being thrown by one of his entourage. When they sat down to eat, the host proudly set a bottle of Courvoisier (cognac) in front of him, clearly indicating that it was solely for his use. By the end of the evening Morrison was passed out, and he urinated in his pants. When he finally regained consciousness, he vented on his host. By putting that bottle in front of him, he had said, "You're the drinking man," and he had conveyed the message that Morrison was expected to live up to (or down to) that reputation. He had not had any intention of going beyond light social drinking that night, but once the expectation of the group had been made clear, he was unable to overcome that peer pressure. He had to finish the bottle or pass out trying.
Brett Gilliam told me that when Sheck Exley died, there were some who flat out accused him of murder--using that word--because of the belief that he and others who were doing the really deep dives in those days were responsible for pressure that pushed Exley to take unnecessary risks in order to meet the expectations of that group.
So how much of that was going on in this case? I don't know. Just looking at what little I do know, however, I suspect that once the whole machinery of this process was set in motion, it would have taken unbelievable courage on the part of "Dr. Deep" to change his mind and walk away.