I went down to the LA Harbor to take pictures of the cool cranes at night from a public street. Security came and told me to move along, to which I answered that it was my right to take pictures from a public street. Well, of course they called for back-up, two more pick-up trucks full of fat guys came, they started jostling me around. Then the cops came, broke it up, and told me to move along. I reiterated my rights, was given a funny look, and told that they'd be glad to take me to the precinct to tell someone "who cares."
My rights were completely irrelevant to the people involved - they hire bullies, and they use national security as an answer for anything, and the cops are disinterested in protecting our rights. So go ahead and print out the .pdf that spells out your rights as a photographer and citizen, but don't honestly think anyone of these people is going to care. At best you might get arrested, have your gear taken, and then returned to you (badly man-handled) a day or so later when they determine that you did nothing wrong. Not sure that warrants spending a night or so in an LA jail - where regardless of your rights, it takes 48 hours to process you out.
Sorry about the bitterness. Maybe it's a little more friendly in other parts of the world.