No doubt the 9/11 attacks were a great tragedy.
BUT, for a lot of people, today is their birthday, their wedding annoversary, or some other REALLY HAPPY day (or at least was until 2002), and they dont necessarily want to be made to be constantly reminded and made to feel oh so bad year after year ... Nobody even said a word on June 6th, Aug 6th or Aug 9th and a hell of a lot more people breathed their last breaths on those days ... I'm not saying the 9/11 attacks should be dismissed, but come on ...
Okay this is controversial and I don't want to step on anyone's toes, but since I know both sides of that coin ( mourning for 9/11 losses and celebrating a 9/11 birthday) I feel confident enough to speak my mind and stand by my word.