I'm probably only sympathetic to his plight because I feel the same way sometimes. Granted, I'm not one of the world's best golfers...or even one of the world's 100,000 best golfers, but still...sometimes when I'm on my way to a 95-100+ round, I just would rather pick up and walk off. So I feel the mental anguish. But as was discussed somewhat relevantly in the Phil thread last year, these guys are pros and people pay to watch them and they are paid to play, so there is a debatable obligation for them to finish rounds.
I've wanted to walk off sometimes, but I never have, and I'm not getting paid millions of dollars to play a game. I don't think the obligation is debatable. Suck it up, Rory.