...might Sartre have meant that the movement was more cohesive, more cooperative, more united ideologically--yet open to change, operating as a well-oiled machine--when facing apparently impossible odds?
Who's to say it has to be a positive thing--from a western standpoint, at least?
Using your analogy, it could be argued that it's the terrorists under Osama bin Laden who may feel that way more than the New Yorkers--more tightly united under a cause they've brought on themselves, fully planned over time, united against a common foe. Now, more than ever, they will draw together, operating as an organic, dynamic, motivated whole. Indeed, having come this far, they have no choice; like Cortez, they've burned their ships...
Of course, this is merely a thought, not any kind of support for [bin Laden's] standpoint or actions.