I think if you look at the general public, if you can catch - I mean, yes, there's always risk to privacy. Because when you look at data going; you can't know "oh, that's a terrorist" and "that's not a terrorist", you probably have to look at more people to find who is a potential terrorist. But I think that you cannot belittle the need to use all possible means to avoid if only one terrorist attack.
Freedom of expression online: Interplay of human rights and ICT (a Greens-EFa public hearing), the European Parliament, May 05 2011