Everyone does. Even as a baseline of "Things that almost all members of it can agree on", our society is incredibly biased in how it views the world.
So is every other society in history. I'm sure ancient Greeks were convinced that they had it all figured out, too.
Fish don't have a word for water. Spend a significant part of your life immersed in a society with a radically different worldview, and it'll be very clear just how arbitrary team blue/red complaints about bias are.
You don't actually want unbiased reporting. It would be either useless, or make you extremely uncomfortable all the time. You're just unhappy that it's got the wrong bias.
