One essential aspect of dialogue is mutual respect for the basic dignity of the people involved. Language that dehumanizes people legitimizes the use of violence against them. For example, as the campaign manager for Trump, Kellyanne Conway has been a frequent target of disdain. This mother of four has now received multiple death threats, and packages of white powder substance have been sent to her home. And examples exist on both sides of the aisle. Instead of dehumanizing the other side, dialogue needs to focus on listening to them in order to understand. The focus cannot be on simply trying to change how the other thinks.
A key question seems to be: How do you create a dialogue where people don’t feel judged and don’t feel like they have to compromise essential parts of themselves?
One simple way of creating civil dialogue is to restate what the other person said and ask if that is correct. What are other ways of doing so?