I think you may have missed the point of my question. Is there a way to define the type of conversation you are talking about butmake it clear that it doesn't 8nclude topics for which viewpoints are bound to be relatively fixed. I think you might agree that a conversation about the existence of God with mixed company or about civil rights with your racist Uncle is going to be unproductive and lead to shouting matches. Let's define this type of discourse and make it distinct from 'poltics'.
It is impossible. It cannot be done. The incentives around politics are too clear - there privileging things some group of people think is acceptable discourse would bringing down the entire edifice of liberal political tradition.
