Um... duh? What kind of human being are you? Nothing to hide... pfft, yeah right.

Until you prove to me there is such a thing as "having nothing to hide," that doesn't ignore human nature, the ideas of privacy, or whatnot, I've got a bridge and two ships to sell you.

Because, simply put, unless they've got probable cause to investigate me, or find out things about me or my activities, it is none of their business, nor the public's unless of course the above case is met or I chose to disclose any information like that.