For 4 1/2 years, not a week, perhaps even a day, has gone by without mention of Sept. 11. Our newspapers and magazines have been filled with stories, often illustrated by graphic photographs of the tragedy. Stacks of books have been written. The war on terrorism has been a central focus of our political lives. So many documentaries and TV movies have been made about 9/11 that reviewers now contrast the new offerings the way film critics compare vintage versus latter-day Scorsese films.” But it’s taken this long for a movie to weigh in…