By Abigail R. Esman World Defense Review columnist "WE WILL NEVER FORGET!" declared the posters taped across the city, the banner strung above the massive hole that once had been the World Trade Center, in the months after 9/11. And for a year, anyway, tourists came to pay respects at Ground Zero while New Yorkers brought flowers to their local fire departments, contributed to funds benefiting the families of those killed, pasted American flags to the windshields of their cars, and somberly marked the eleventh day of every month that passed. But four years later, to walk the streets of...