Before we get too over-excited, a version of this law has been in operation for several years in the UK, and for much longer in Northern Ireland, IIRC, and is aimed at people doing reconnaissance for terrorist attacks. It doesn't make it an offence to take photographs of policemen, soldiers or spies, it makes it an offence to collect information about them 'likely' to be of use to terrorists. Like most common law jurisdictions, it will ultimately be up to the courts to interpret what that means and I suspect most judges would take a dim view of the police arresting people simply for taking innocent photographs of policemen.
Probably truth to that. What I would like to see is the exact wording of the law. What is in the article is pretty vague. No court is likely to like that. I could take a photo of a relative who was a policeman. Then post it on my family web site for all my relatives to see the policeman we are all so proud of. All of us would rejoice. However, what is to say a terrorist would not use that. That would put me in violation as the article relates it. I suspect the law is more specific, and hopefully requires something more than simple innocent photo taking for police action.
Beyond that, I deplore some of the reactions to 9/11 and terrorism in general. The problem is that we are in some sense, at war. At least in the US, we tend to pur up with some curtailing of our freedoms in war. We understand the need to be more suspicious if for no other reason than to scare away all but the most fearless enemies.
However, this isn't a normal "war." I am not sure we need to be as quick to give up freedoms. Especially we need to make sure if we do there is a certainty we will gain more that we lose. I don't see it with the referenced law. My personal opinion is that we need to take the war to the terrorists. I don't think we have really done that, or at least not effectively.
As to police; they are just as human as anyone else. They do tend to deal with the dregs of humanity. Unfortunatly, that often causes them to take on some less than desireable reactions in defense of their own sanity. One of those is a tendency to be more rough on suspects than is alway necessary. Wrong, but frustration is a strong emotion. Even when they may not be wrong in something they do, they often get portrayed as such either in the press, or in public misunderstanding. That fosters a we/they attitude. Not desireable, but again, when you feel you are right and "outsiders" still cut you down and call you wrong, what can you expect.
I don't say police should be excused for beating up a suspect when there is no more resistance. (I do believe if a suspect is fighting, the policeman is allowed to do what it takes to subdue them. Policeman aren't paid to get beat up themselves). Nor should police be excused for any intentional actions to violate anyone's civil rights. Those are violations of law and police are susposed to prevent or arrest lawbreakers, not be come intentional lawbreakers.
However, I would say don't be too quick to assume police are just looking for ways to arrest law abiding citizens. Or that they want to be part of a police state. Most hopefully get into law enforcement out of a sense of wanting to help their fellow man. They want the same things the rest of us do. Just try telling some of them they are appreciated from time to time. They may become better people too.