The Sears Tower is always coming up as a target. I don't think I would renew my lease if I were a tenant.
The mistake was NOT to rebuild the WTC towers IMMEDIATELY.
The inventory of tall buildings in America needs to increase to remind the Islamic mouth-breathers that try as they might, there efforts are futile.
New York victim/wimps have squandered psychological momentum by not restoring the towers.
Like graffiti that stands years later, the WTC destruction simply encourages attacks on the perceived finite stock of important buildings.
If you take a moron, and remove its character, ability to think, and replace its head with a concrete block, you would get an Islamic militant. Remove its courage, and you would get a Liberal.