At Positive Liberty.
My favorite passage:
The terrorists' choice of targets, though, reveals not a strength but a curious weakness. In seeking to end the West, they have attacked what they consider to be the heart of the urbane, commercial, cosmopolitan, and individualist culture they despise. Their attacks on the Pentagon, the World Trade Center, and the public transportation systems of major cities all reflect this tendency: Strike at the center, and everything else will fall. They have a special wrath for financial districts, for here they hope to hit the mainsprings of the West. Once these mainsprings have been destroyed, the rest of the machine will cease to function.
In particular, it is interesting to note Osama bin Laden's fascination with the World Trade Center, which his organization sought to destroy on at least one occasion prior to September 11. It is as if he believed that by striking at the center of western business, the West itself would be dealt a fatal blow.
It did hurt. But in a very real sense, there never was a "world trade center," and as such, it could not be destroyed. Trade does not have a center. The genius of the market, and of the West, is to be decentralized, to exist without any necessary order or hierarchy, to have a billion brains but not a single head.
Terrorism won't bring down an organization like that. It can't. This organization, this spontaneous order, is unique to free societies. It cannot be killed by a well-timed physical blow at some carefully chosen point. Raised on authoritarian propaganda, the terrorists do not understand this.