It seems like Americans like to black-and-white every decision, binarize every election (leading to two political parties; any alternative is disregarded). That mentality is taught since generations and cultivated by those press articles and many cultural products. It eases the herding of mass opinion, and by denying immediate access to intellectual subtlety, it makes philosophical though more alien and generates anti-intellectualism in scientific and cultural areas where subtlety and self-criticism are key.
Maybe my indirect reading is biased by the most prominent cultural exports of the US, or their the most vocal representatives. I would welcome the opinions of insiders.