How does bias limit our understanding of the world? What kind of experiences can widen our perspective?

This is a pretty detailed question for this short answer forum space. I suppose bias is closely linked with racial prejudice. This is one of the main themes of the story. The more biggoted a person is, the more ignorant they are. Bob Ewell cannot get past his small tortured bubble of ignorance and hate. He cannot contextualize a more inclusive and progressive world beyod Maycomb. He is thus caught in his own dark world of ignorance and hate.

"Too proud to fight, you nigger-lovin' bastard?" (Chapter 23)