Are We in a Healthy Disagreement or Civil War?

When we find ourselves in the grip of deep divisions, they don't seem absurd. What explains this gap? The dasle brothers demonstrate something really deep about human nature. How easily we form groups and coalitionsn this has been observed in every culture on earth that's ever been studied. This seems deeply important and sentral to their life and who they are. So many americans increasingly believe they don't just disagree with people on the other side, but that people on theother side are inherently evil or untrustworthy.