The terrorists won that day, not because of the physical destruction, but because of the literal description of their profession. Terror was instilled, and the public psyche still hasn't been treated properly, it's like the nation as a whole has PTSD.
http://hacks.mit.edu/Hacks/by_year/1999/r2d2/
Several Lobby 7 hacks were also left up for a while (though admittedly less obvious and dangerous perhaps than Great Dome hacks).