The first is the rather simplistic answer: "Well, I've got nothing to hide, so it's fine."
Kind of like that guy whose hand-held sign called left-wingers "Morans" back in the days following September 11, 2001.
And the second answer is "No freaking way! That's my business and not the government's."
How 'bout this new one I thought of? "Are you kidding? I want people to see what cool books and music I check out." All right; that's about as mindless as the first answer. But I have to admit that when that low self-esteem thing hits me, which is often, I need a little joke like that to pull me up.
Dar Williams (author of the song "As Cool As I Am") would be proud.