Why do we insist on commemorating tragic events year after year? It's not as if any of us will or can ever forget 9/11 or Hurricane Katrina or Princess Diana. I don't think we gain anything by holding yearly remembrance ceremonies.
I say we commemorate only birthdays, weddings, and other such occasions. The bad things, and those who suffered as a result, will not be forgotten. Should we carry sorrow over indefinitely?
Well, at least some people are trying to turn 9/11 into a positive thing: a day to do good deeds. More power to 'em!