Of course, I think this is partly the result of not teaching civics in schools.
The thing that made it good was the camaraderie, the general helpfulness, and the quality of posters. You used to be able to find some really intelligent content in the Slashdot comments, since some the smartest people related to that particular topic were probably Slashdot users themselves.
We have civics at high school (of course not in the Finland sense, sadly), and I somehow fail to see the correlation.
I still visit it every day just to skim the articles, but only about 20% of them are interesting/something I didn't see posted somewhere else.
Smarter moderation might work here in the short term, but ultimately the only thing that works is quietly sneaking off to a newer forum.
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.
To them, it is. Humanity's progress depends in part on freshly disillusioned young people to overreact to life's shortcomings and fight to correct them.