The whole thing raises a lot of issues - some of which I mentioned in my post of 7th March - but the German, French and UK governments are all seemingly happy to do it, and at least so far there seems to be very little resistance or outcry about their tactics. The ends justify the means, perhaps. Personally, I don't think so, and an experience I had in the classes I teach (Information Technology & the Law) suggested to me why. The class was about surveillance in the digital environment, and we were discussing the nature of enhanced CCTV, and how it, combined with information from systems like Oyster Cards, could allow coordinated tracking of individuals. I teach three classes, with a mix of different individuals with very different backgrounds. In the first class, the reaction to this kind of tracking could be described as general interest, but nothing more. In the second, it might even be described as enthusiastic - with some agreement with the view of a Police CCTV Liaison Officer that "The cameras are there to help the police and to protect the community. There is no way anybody should be afraid of them unless they have something to hide."
The third class was different - the first person to speak had a reaction that I hadn't really heard in the first two classes. His immediate response was that he didn't want the government to be able to track him - and when asked why, he almost laughed, because to him it was so obvious. Why was it obvious to him, and not to the others in the previous classes? Because he happened to have experience of living in a country with what is close to an authoritarian regime. People who live in those circumstances are naturally and appropriately more likely to be suspicious and distrustful of government motives.
Here in the 'safe' West, where the governments are suspected much more of incompetence than evil, we don't really seem to care that much about things like this. Right now, we seem to mostly 'trust' our governments, and imagine that they will only use the powers we grant them (or allow them to take for themselves) for good purposes - like catching tax evaders, or tracking terrorists. We rarely imagine that they might end up using them for entirely different purposes, purposes for which we would have much less sympathy. What would it take to make us realise the risks, let alone take them seriously? It would be nice to think that we could do so before they are taken too far.