Well, the stories are submitted by users and voted up by users. Logically, if you think about it, depressed people probably spend more time on social news sites than people who are not, since people who are not are more likely to spend more time working. So depression stories probably have an audience more engaged with the site.

The staff do tend to ban or cripple votes of things like NSA stories and whatnot when they want to interfere, but you are talking to the wrong people for an admin hack.