I rarely see negative threads about the US on hackernews, but not a day goes by without the regular anti chinese/russian propaganda, especially concerning military and/or technology.
I see plenty... often times it's more corporate focused but frequently it's about how those corporations interact with the government/society in ways that implicate government/society as well.
Thanks for the chuckle, but shitting on the USA is one of our favorite passtimes on HN as Americans, so it kinda makes your "b-b-but what about the USA" here into a trite eye-roll.
It's like complaining HN never talks shit about Javascript in a submission that shits on PHP.
You must not be looking, then.