This seems like something completely sensible and even predictable for the NSA to do.
Why does the NSA need defending this badly anyway?
It just feels really out of place under an article focusing on the technical side of things, not accusing the NSA of anything nefarious.
Despite neither the article or any of the comments here suggesting there's anything wrong with the NSA activities being discussed, several users felt the need to preemptively stand up the agency:
https://news.ycombinator.com/item?id=16536778
https://news.ycombinator.com/item?id=16537479
I don't know exactly what to make of it, but this kind of behavior just seems strange to me.