The United State government should not be allowed to surveil its citizens and invade privacy in the interest of national security. The right to privacy was declared a basic human right. Taking that right away will weaken the voice of the citizens and allow the government more opportunity and more reason to increase surveillance in the future at the expense of other rights. This increased surveillance also increases the chance of an abuse of power.
If citizens allow their government to take away one right, then what is stopping them from taking away others on the basis that it will increase security? If a government knows it can get away with infringing upon the rights of its citizens, aware that the majority will not stand up and question them, it will be more inclined to abuse its power with the knowledge it is likely to suffer little repercussion if caught. There is evidence that the government has abused its power, especially when it comes to infringing upon the right to privacy. The government unjustly wiretapped telephone conversations of Martin Luther King Jr. and fed the information to Senator James Eastland, which he used in debates regarding a civil rights bill. Presidents such as Lyndon Johnson and Richard Nixon have been accused and proven guilty of unjust wiretapping (Singh, Ch. 7).
The U.S. government has shown its willingness to break the law and infringe upon the privacy of its citizens, allowing them to surveil the citizens for increased security. Allowing them to continue conveys that it is ok for them to do so. In the end, we will lose much more than just privacy. We lose our voice, our freedom and our rights.