What Colin and nocturne have written is exactly what I had in mind when I said;
but they're better at expressing it.
I would like to clarify my comment;
This only meant that the authorities and politicians would do better to consider photographers as allies in the war against terorism, rather than alienate some* of us. Not that the threat was unreal or they shouldn't be vigilant and do their duty; ask questions, even conduct polite searches, etc.
* Of course, the popular press and internet rumour mill are often only interested in the horror stories, so they get the most publicity. Fortunately here (at C in C), a more balanced picture is emerging.
It wouldn't surprise me if, at 2 a.m. with no one else around and only each other to talk to, the chance to have a chat with anyone else might be jumped at, out of sheer boredom, if nothing else.
My Dad was a police constable (a long time ago), so I have seen both sides and I certainly appreciate the hard and often thankless job they have to do - especially these days.
I like Colin's idea of possibly forging a relationship, although it may only work in selected areas like your home town and there is a possibility of it being mis-interpreted - I'm sure they've heard 'I know your chief inspector personally' many times from cornered criminals.
That sounds rather negative, sorry. Maybe they do keep records of people that they consider are harmless if found photographing at night, etc.