US social discourse shows that people don't understand how to debate and how to negotiate with opposing views for a better outcome. These are merely group behaviours and they can change with time and education.

I feel that the first structural steps must be

1./ Replace First Past the Post (it distorts the will of the people) with some version of ranked balloting (already in use in at least one US state)

2./ Dissolve or fix/improve the Electoral College