"Little girl brutally murdered after FB's privacy controls reveal her to a crazy stalker"
People just don't respond to rational argument, data, and talk the way they do to fear. Obviously for the little girl's sake I hope this never happens, but honestly I don't see Facebook going down any other way anytime soon.
Facebook's earlier negatives were more in line with employers screening you out of jobs or tracking your use (http://mashable.com/2009/08/10/social-media-misuse/)
Now with privacy being the big story, this may evolve to more of what you suggest, though there are already horror stories: http://www.dailymail.co.uk/news/article-1256552/Facebook-sta...
It's not clear what drives the stories/cultural view, though 146's comment about having a viable alternative seems to be important in actually causing people to quit a service.
Who are the 'facebook enemies'?