Some of this is because the HN demographic is young enough that many readers have never seen anything like this before, and thus think it's the Worst Thing Ever. I base this on the numerous counterfactual statements showing a lack of historical awareness in discussions on contentious topics. Of course, I think this is partly the result of not teaching civics in schools.
That's true. On the other hand, maturity often comes with apathy to real societal problems and abuse from bad actors, masked as greater insight: a sense of "that's just the way things are".
I feel much of those sort of posts would be remedied if people were more interested in the history of the world going back more than just within their own lifetimes + 20 to 30 years. I'm still in my late 20s, but most people I know only have a passing interest in history (even less so when it's not about their country) and saw such courses in school as a burden, rather than useful. I was just lucky to have family that encouraged having an interest in history and how it shaped the world. To me, it's just as important as teaching one's children about Science, Programming and Mathematics.
News and information are also much more widespread now than they were 10 to 20 years ago, so many start to think this is a new phenomenon as it used to be more difficult to stay informed. History is just repeating itself with some additional ingredients mixed in and outrage is not useful when nothing comes of it.
The phrase "Why should I care about history?" never range more true when people express outrage over issues such as the NSA. The "good old days" are not as good as many people like to believe. That does not mean we should roll over and accept everything though.