So see it this way then: you conflate bias and variance, which is a big no-no in experimentation:
Er, no. My comment was about a person's perceptions. This has nothing to do with reality; People's perceptions are highly skewed based on expectation and personal biases. One of the first things they try and teach you in any art class is overcoming this; You have to throw away your ideas about what something should look like, or you'll never get past stick figures. Instead, you draw as though you are seeing this thing for the first time. We intentionally take everyday objects in class and hang them upside down, or throw it in with a pile of junk, and the sole reason for doing this is to break this need for the rational mind to enforce its expectations on even the simplest of perceptions.
A person cannot, without training and significant self-awareness, overcome these biases, these expectations, these preconceptions. And while you might think art and science are on opposite ends of a spectrum, they are very much alike -- science is about accurate observation. Curiously, so is art.
I've looked at the data regarding popular sources of news and the biases they have at the institutional level; The author of Freakonomics did a TV interview about it. While admittedly it was not a robust and extensive study, it was certainly a lot more effort than anyone here has put into it -- and he found that Fox News and the New York Times were about as equally biased relative to average (zero point).
Now I've been modbombed into oblivion for daring to go against the rabid hipster crowd here on Slashdot that wants to make Snowden a hero and suggesting that The Guardian is a biased source of news... but I will continue to say so no matter how many times someone goes through my comment history and blows all their mod points on me.
People despise having a mirror held up to them -- everyone. Every. Single. Person. On this website considers themselves above average, intelligent, thoughtful, and blah blah blah. And when they come across evidence that goes against this, they get very vindictive. To me, nothing confirms the veracity of my statements like this reaction does. Even you managed a strawman here, and you seem at least somewhat more thoughtful than the other guys imagine themselves to be.
Personal biases are incredibly hard to see, and even more difficult to overcome. They are cognitive shortcuts that very often serve us well in everyday life -- but these shortcuts are overused and eventually move into the subconscious, where until they are dragged kicking and screaming back to conscious thought, they will sit, quietly distorting every perception that person has. There are monks living up the sides of mountains that spend their entire lives trying to transcend this glitch in the human mind. There's a reason racism, sexism, religion, etc., are all so prevalent -- this is not easy. If it were, I wouldn't ever need to post anything on Slashdot ever again; We'd all be reasonable and unbiased people... and there'd only ever be a couple of comments in each story. -_-
But we aren't reasonable, and we're biased as hell. All of us. Me, you, the person reading this. It's human nature to have them, just as it's human nature to hate people who point it out.