The post you're commenting on is a PDF file hosted on cia.gov, how is that any better? Or are you assuming that all readers of HN 1) are American citizens, and 2) that American citizens shouldn't care about possible threats from the CIA?
hacking provides a significant portion of the North Korean economy. the same cannot be said for the USA.
besides, the CIA has a lot more to lose. if you get a virus downloading a PDF from North Korean servers, that's The Scorpion and the Frog. you're not gonna get much sympathy. if you get a virus downloading a PDF from CIA servers, that's near enough an international incident
I think analogies can be taken too far, but "both North Korea and the US are probably interested in compromising the computers of their adversaries, and may intentionally or unintentionally infect others in the process" doesn't seem too far-fetched to me. It's not the same as saying "North Korea and the US are functionally and ideologically the same."