Back in 2004, when a NYFD chief reminded the 9/11 Commission that it was never in "anyone's consciousness" that the Twin Towers would fall, he underscored a terrible truth. After 9/11, we entered the Age of the Unthinkable. Seared into our collective consciousness is that the Twin Towers could and did fall. So could the U.S. Capitol, the Golden Gate Bridge and the Superdome. Our children know that which we as children never before imagined -- passenger planes may become guided missiles, and skyscrapers may turn into smoking, twisted rubble. This age of Islamic jihad against the West has indeed...