I answered this below, but the environment may well have changed for the better from 15 years ago, but I doubt it. I obviously didn't mean to imply that the se

I answered this below, but the environment may well have changed for the better from 15 years ago, but I doubt it. I obviously didn't mean to imply that the security services are "spending their time sitting in leather chairs and petting cats menacingly". They are busy people. They have somewhat a limited number resources at their disposal (unless Downing Street have a crisis on their hands that makes them look bad in the eyes of the public) and they are required to maintain a control on the country's security. When you work day-in day-out on actual, but mostly perceived threats, you have a tendency to evaluate people quickly and then categorize using learned and automatic cognitive processing methodology. I.e. "Threat, no threat, suspicious, flagged, threat, no threat" etc. As an example: 20-30 years ago all people entering the UK from Eire or (especially) Catholic northern Irish were considered potential threats. It didn't matter if you had intel on a person or not, the suspicion was still there based on their passport. You still had real Irish intel came from paid informants, so we would know who the problem people were and would watch them from the moment they landed. Ideally we didn't lose them whilst they were here otherwise we have scenarios like lorry bombs going off in Canary Wharf. Now we've moved on from "the Irish problem", and the Irish intel desks are almost all disbanded. All the resource has been moved onto Islamic fundamentalism and a bit is maintained on watching the Russians. In between the Irish Peace Accord and 9/11, when we ran out of things to do, there was some focus on internal radicals like the Animal Welfare groups. It sounds clichéd, but you need to have a target group, or where are you going to spend next year's budget? I'm not taking away that they are good people in the security services, but their insular jobs lead them to be an insular group of people. Much of what they do is never seen by the public. When you hear of a group of people arrested under the Anti-terrorism legislation, more than likely there was a credible threat. How they do their job is often sailing close to the wind. When it comes to the blanket surveillance, there are obvious benefits to the security services and maintaining the security of the country. It is a very very useful tool. It is unfortunately not beneficial for any other purpose, and is contrary to our beliefs concerning privacy and a right to live without being persistently monitored when innocent. I also forgot to note earlier, but there is somewhat a difference between desk officers (intel analysts) and operational officers. Operational officers are even worse, but they are constantly dealing with people that are dangerous and real threats to the public and the officers. They have to compartmentalise in order to save their own lives. Any law enforcement officer that carries a gun will tell you that.