It's often said by those who take away a freedom from intrusion in exchange for the promise of some kind of protection that "Those that have nothing to hide should have nothing to fear." The current British government often says this in connection with ID cards, the DNA database, and the monitoring of phone calls and emails.
So when the current British government refuses to release the minutes of cabinet meetings in 2003 at which ministers discussed war with Iraq, we have to ask "What are they trying to hide?"