Essentially, it's because you can't trust what people tell you.
Ask most people what they'd like to see more of in the news and they'll tell you the same thing - less "human interest", more commentary on global events, less celebrity gossip, more context about the important stuff, so we can get beyond the headlines and really get to grips with the world around us.
And until recently, we'd see other people on the tram with their nose buried deep in a broadsheet, assume that's what they were reading and feel guilty about turning straight to the TV section ourselves.
But the "most popular articles" section on newspaper websites has out paid to that. Here's today's for Fairfax, steadfast guardian of all that's socially engaged, middle-brow and middle-class in Australia.
Forget massacres in Darfur, global warming or elections in East Timor. What's really important is anything with the words "oral sex" in the headline.
I know it's the first article i went to.