"NSA employees spied on their lovers using eavesdropping programme"

The fact that NSA employees spied on lovers enough times to give it a name tells us a lot.  If employees could spy on others for personal reasons, why would believe that they couldn't do so for undesirable political reasons.  From the UK Telegraph:

The employees even had a code name for the practice – "Love-int" – meaning the gathering of intelligence on their partners. 

Dianne Feinstein, a senator who chairs the Senate intelligence committee, said the NSA told her committee about a set of "isolated cases" that have occurred about once a year for the last 10 years. The spying was not within the US, and was carried out when one of the lovers was abroad. . . .

Now they refer to these violations as "mainly unintentional."  

John DeLong, NSA chief compliance officer, said that those errors were mainly unintentional, but that there have been "a couple" of wilful violations in the past decade. . . .

Just a week ago we were assured that none of the violations were intentional.

Senate Intelligence Committee Chairwoman Dianne Feinstein (D-Calif.) defended the National Security Agency’s surveillance programs Friday, saying that she has never come across an example of the NSA deliberately abusing its powers.
Feinstein released a statement in response to a Washington Post report detailing thousands of privacy violations committed by the NSA every year.
“As I have said previously, the committee has never identified an instance in which the NSA has intentionally abused its authority to conduct surveillance for inappropriate purposes,” Feinstein said. . . . 

See also this discussion from CBS News.