For those that don't think the current NSA surveillance program is no big deal, consider what was happening 50 years ago
Through the 1940s, 50s and 60s, the United States and in particular J Edgar Hoover's FBI built up an elaborate surveillance system that was supposed to be for keeping tabs on the Soviets and the communist menace.
As inevitably seems to happen when such a system exists, it was turned inward to spy on Americans such as Martin Luther King Jr and the head of the household at 1600 Pennsylvania Ave in Washington, John F Kennedy. Over the decades of Hoover's tenure at the head of the bureau, they also filled dossiers on countless well known Americans that dared to protest government policies.
When you create such a huge and wide ranging police state it will inevitably be abused.