I hate commemorating such a tragedy.  I want to commemorate the heroes, rather than destruction and grief.  We have to move on, and really rebuild rather than just masking it all over.  I don't like calling it "Nine Eleven" or "Ground Zero" - code words, numbers assigned to yet another act of violence. 

On September 11, 2001, several planes were hijacked in a coordinated attack against American people using very populated landmarks.  Some were successful, some were not because of the heroism of those on board the plane.  Some say it was an inside job, some say it was religious extremists.  Some say it was a political move.  Whatever the cause, we've never moved forward.