Did you know that Anarchists bombed Wall Street on September 16, 1920? Should we have built a memorial?
Puerto Rican Seperatists bombed Fraunces Tavern a couple of blocks away in 1975? Should we have built a memorial.
Comumbine High School is open for business. Life goes on.
Morbidity accomplishes nothing, and Manhattan real estate is not empty space in Pearl Harbor.
I know all that stuff happened. But the scope and extent of damage, as well as the influence of the 911 attacks, puts it in a class by itself.