Against the instrumental argument for surveillance

In my latest Guardian column, 'Cybersecurity' begins with integrity, not surveillance, I try to make sense of the argument against surveillance. Is mass surveillance bad because it doesn't catch "bad guys" or because it is immoral? There's a parallel to torture -- even if you can find places where torture would work to get you some useful information, it would still be immoral. Likewise, I've come to realize that the "it doesn't work" argument isn't one that I want to support anymore, because...