Charlotte AllenAuthor of The Human Christ.Sept. 11, 2001 was the day the Nineties died. Not the decade, of course, but the cultural phenomenon: the tasteful excess, the fretting over whether the baked Alma Ata yak brie really went with the organic spelt toast points, the days when "the president's blow job" meant something other than blasting al Qaeda the hell out of Tora Bora. America sobered up, and it was suddenly all right, even heroic, to be just an ordinary American. Frivolity is so over, so last-decade. That's why witty airheads like Maureen Dowd now come across as op-ed...