Might it be a manifestation of that worry about "the government" that I so often read about? Big Brother wants to have files on us so that it can control us, something like that?
If you ask me, that might be letting a perception of self-reliance go a bit too far. Americans don't seem to have that little a reliance on governments. There is a real need for urban planning and the like, and that means a need for learning about the people.
Also, it seems to me that a government gone wrong would not particularly need or care about the photos of the people it might conceivably be exploiting, don't you think? Control of the military, of water resources, of transportation rotes, of mint and economic policy... all of those sound a lot more noteworthy to me, and I don't think Americans have found much of a way to be independent of the government for that.