This is not particular to American society, you can see the same in France (where the left and right divide originated), the UK or any other country or indeed r

This is not particular to American society, you can see the same in France (where the left and right divide originated), the UK or any other country or indeed religion - people are tribal, and don't really care about details enough - the sense of belonging to a group and the rewards that brings trumps judging issues individually on their merits.