NSA doesn't intend to use the data about you just now because you are not a person of interest for them. But they need it in case if you find yourself on their way in some point in the future (i.e. you find a proof that the event x/xx was a false-flag attack or there is a little gray alien in president's attic) then they will use it against you.

Especially if you are an elected official.

https://www.aclu.org/blog/national-security-technology-and-l...

"... a Washington Post report based on Snowden documents that the NSA had intercepted a “large number” of calls from the Washington DC area code due to a “programming error.”"

It is the hallmark of totalitarian regimes – throughout history – to monitor the populace and politicians alike.

The United States is, of course, not a totalitarian regime, because the NSA was not interested in the content of these communications, but merely the metadata.

NSA Collects 'Word for Word' Every Domestic Communication, Says Former Analyst http://www.pbs.org/newshour/bb/government_programs/july-dec1...

> The United States is, of course, not a totalitarian regime, because the NSA was not interested in the content of these communications, but merely the metadata.

They love content, actually, since it holds more material.

http://news.cnet.com/8301-13578_3-57589495-38/nsa-spying-fla...