NSA spying program is justified as protecting america from terrorists, and many people (KevinNYC, gigantes apparently...) accept this justification without much thought.
The reality of these programs is that they have absolutely nothing to do with "terrorism". The reality is that intelligence infrastructure like PRISM and Fusion centers has been built with the purpose of monitoring and controlling political dissident groups like occupy, right-wing millitias, and environmental activists.
It is important to note that these tools are not to protect the "government" from activists. These tools have actually been put in place to protect the private interests that control of the government - corporations like Bank of America and Monsanto that are increasingly afraid of massive citizen backlash.
Dissent or Terror: How Arizona's Counter Terrorism Apparatus, in Partnership with Corporate Interests, Turned on Occupy Phoenix - http://www.prwatch.org/node/12112
Fusion Center Obsession With OWS: Monitoring Jesse Jackson, NDAA Protestors and Anything Else Deemed To Be a Threat - http://www.prwatch.org/node/12123
Operation Tripwire -- the FBI, the Private Sector, and the Monitoring of Occupy Wall Street - http://www.prwatch.org/node/11924