"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?'
...
"Privacy protects us from abuses by those in power, even if
we're doing nothing wrong at the time of surveillance.
"We do nothing wrong when we make love or go to the bathroom.
We are not deliberately hiding anything when we seek out private
places for reflection or conversation. We keep private journals,
sing in the privacy of the shower, and write letters to secret
lovers and then burn them. Privacy is a basic human need."
-- Bruce Schneier, "The Eternal Value of Privacy".
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http://www.wired.com/politics/security/commentary/securitymatters/2006/05/70886]