Why do people ever expect reason to be a part of this? This quote shows exactly the point of surveillance (and torture for that matter). In a reasonable world, science and reason hold the greatest possible power. To perform surveillance despite the fact that it doesn't make sense is to exert one's power over reason itself. You cannot argue with an entity wielding such power, they have empirically shown that they are more powerful than reason. Follow this line and the only reasoning you are left with as an individual is submit or...
I've pasted this a million times but I strongly believe this is the absolutely most important quote from 1984 (from O'Brien torturing Winston Part 3, Chapter 3):
"We know that no one ever seizes power with the intention of relinquishing it. Power is not a means, it is an end. One does not establish a dictatorship in order to safeguard a revolution; one makes the revolution in order to establish the dictatorship. The object of persecution is persecution. The object of torture is torture. The object of power is power. Now do you begin to understand me?' "
We could easily add to that 'the object of surveillance is surveillance'. There is no end game in any of these assertions of power other than expression and confirmation of power: not security, not prosperity, not even the welfare of the nation.