JOHN DICKERSON: The disturbing glee at Mark Sanford’s downfall. “What Mark Sanford seemed to be trying to say is that he screwed up, in the biggest possible way, because he lost his bearings. He lost his self-control. He was indulgent. He forgot that there were other humans in the world. Yet in the constant flow of abuse, joke-making, and grand conclusions about his failings, it seemed everyone having a good time pointing at his self-indulgence was also engaging in a form of it.”