The next time somebody gives you that "nothing to hide nothing to fear" assclownery, tell them you just don't want to be audited. Not wanting to be audited is not only perfectly legal but sensible too.
Every time somebody speaks up about the "nothing to hide, nothing to fear"-mantra, I ask them if they would be comfortable with somebody from the govt. sitting in their living room staring at them checking everything they do. If they say: "I suppose so, if that's what was needed...", then I proceed to ask: "Would you've liked to have the same gov agent at your bathroom, looking at you making a dump or taking a piss, then analyzing that waste for narcotics or just for the hell of it?"
Most people will then look quite disturbed at me. And then I say: "If you've got nothing to hide, you've got nothing to fear?"