Security at Manhattan Skyscrapers

from James Wolcott:

"The darkness at ground zero just got a little darker. If there are people still clinging to the expectation that the Freedom Tower will become a monument to the highest American ideals, the current design should finally shake them out of that delusion. Somber, oppressive and clumsily conceived, the project suggests a monument to a society that has turned its back on any notion of cultural openness. It is exactly the kind of nightmare that government officials repeatedly asserted would never happen here: an impregnable tower braced against the outside world."

Can you imagine what the security will be like for workers, visitors, and deliverers to get into that fortress? You practically have to give blood and undergo a retinal scan now to get into some midtown buildings.

I'm curious-- if the twin towers were really brought down by airplane impacts/fuel fires and NOT by demolitions, why are people in NYC so uptight about skyscraper security in terms of street traffic now?

I'm just wondering if this tight security is some tacit hint that there were demolitions involved in the WTC collapses...