September 11 changed the world, . . . no doubt about it. . .
It changed the laws on terrorism as well as peoples perspective toward terrorists, as well as toward photographers.
People are uneasy with people taking photos in public, and can get upset of this. But if you are in a public place, anything within public view is fair game.
Check these links to how 9/11 changed photography.
Here is one about your rights.
Here is a story about photographers being arrested, when they are in a public place.
Know your rights, but be polite if confronted.
Alot of it, is just people trying to intimidate and flex muscle when they shouldn’t be.