Based on the last posting, I want to dabble a little farther into psychology with another one of my really far flung analogies.
One of the biographies of Jim Morrison of the Doors tells the story of a time he joined a bunch of others at a dinner party. As they sat down to eat, the host proudly set a bottle of Courvoisier, his favorite Cognac, in front of him, clearly indicating it was for him to drink with the meal. Before the evening had come to a close, Morrison had passed out and wet his pants.
After coming to, in a moment of anger and rare lucidity, he lashed out at the host for giving him the bottle. He said that putting the bottle there meant, "You're the drinking man!" It implied that he had a reputation to uphold, a reputation that was held in high esteem by his many admirers. He felt he had to live up to that reputation and drink the whole bottle, something he would not have otherwise done.
I wonder if some people don't put themselves into that situation by building an image of being on the edge, an image that brings them esteem and admiration. They then have to keep pushing and pushing in order to maintain that image of being on the edge, of being a person worthy of that esteem. Once you have told the world that you are a daring cave diver who goes far beyond what others do, it is hard to suddenly decide to show restraint and common sense, even if in your heart you know better.