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.
"... 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.
> 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.
