"If you've done nothing wrong, you have nothing to worry about"

I really get annoyed when I read this in a news article, or quote or show of some sort. There's rarely reasonable discussion about it, and almost never pressure against it. Identity fraud is usually the only push-back, and that's usually responded to with "oh, it's not likely to happen to you".

"if somebody's not going out to cause trouble they shouldn't have any problems having their ID scanned" - ID scanner company director Joel Sheehan quoted in ID scans raise privacy fears on The Age

The guy obviously has a vested interest. Some good discussion on why this is never a reasonable point of view. E.g. "Privacy protects us from abuses by those in power, even if we're doing nothing wrong at the time of surveillance." - Bruce Schneier

Also this MetaFilter thread.