Privacy - It is everybody's business

The Eternal Value of Privacy By Bruce Schneier 02:00 AM May, 18, 2006
The most common retort against privacy advocates -- by those in favor of ID checks, cameras, databases, data mining and other wholesale surveillance measures -- is this line: "If you aren't doing anything wrong, what do you have to hide?" [Wired News]

I will not even begin to compete with Bruce on this. Go read the commentary then go read the Constitution. If you have any questions, go back to step one and repeat.