Comments for the sake of humor are generally frowned upon on HN. The exact same topics are usually posted on reddit, where anyone is welcome to meme and joke all day. HN tries to stick with substantive, interesting commenting. I am not trying to speak for everyone, this is just what I have viewed.

Jokes will sometimes fly, but it's usually in pretty inactive subjects and they aren't political like yours.

Humor's fine, it's just that the bar is higher. Most internet humor is lame, and that stuff grows like crabgrass. scott_s expressed this well a long time ago: https://news.ycombinator.com/item?id=7609289.

By the way, if there's a clique we personally invite you and everyone else to be part of it.

FYI: 'no such agency' is what people used to call the NSA.

So, it was a substantive if simplistic comment, and a joke. Basically, 'Yea not the first time there has been a secret organization within the US government before.' + 'Sounds like a job for the NSA' + the double speak joke' of of course they would never do that.'