That was the argument before Snowden, but we now know that the government passively records and stores as much information as possible on anyone. So they can build a secret file on anyone should they feel like it. And they'll use every piece of information at their disposal (private family life, shopping and travel habits, what websites you browse, what media you consume, etc.) to profile you. Ever download a copyrighted file or view pornography? That will be used against you.