Interesting and very true. In my adolescence I began reading Buddhist stories and one in particular stands out when it comes to bias.

A Cup of Tea

Nan-in, a Japanese master during the Meiji era (1868-1912), received a university professor who came to inquire about Zen.

Nan-in served tea. He poured his visitor’s cup full, and then kept on pouring.

The professor watched the overflow until he no longer could restrain himself. “It is overfull. No more will go in!”

“Like this cup,” Nan-in said, “you are full of your own opinions and speculations. How can I show you Zen unless you first empty your cup?”

We can't take in any new information if we are already filled with bias. Here's a link that actually going into it in more detail: http://thestonemind.com/2012/02/27/zen-story-a-cup-of-tea/

I actually forgot about this story until now but I'm quite happy I was reminded of it. I started thinking this was just some phase I grew out of but really it was taught to me. Which on one hand means it can be taught to others but also means only if they want to hear it. The answer is never simple.