Bruce Schneier says it better than I can "Too many wrongly characterize the debate as 'security versus privacy.' The real choice is liberty versus control".
I highly recommend this http://www.wired.com/politics/security/commentary/securitymatters/2006/05/70886
As far as I can see the US has accepted a level of control which would have been regarded as a tyranny a while back, while gaining zero extra security. You have not traded privacy for security; you have given up privacy and gained nothing.
Your security is no greater now than it was before 9/11. What aspects of that tragedy would the current situation have stopped?