Most of the accidents that happen on the Nose are the same types of accidents that happen elsewhere. Climbers succumb to objective hazards. They take falls and pull out protection. They get tired, overestimate their abilities, or make mistakes. A climb of this scale elevates not only the climber’s ambition, but also the stakes, in a way that only 3,000 feet of towering granite can.
If you're considering a run up the Nose, then this is a good write up to reference when considering the errors that people have made in the past. Like the quote says, accidents on a Big Wall are the same kind that happen at the crag....you're just 2,000 feet off the ground.