I don't believe that Americans are unenlightened savages. I believe that they have a very limited cycling culture, due largely to the dominance of car culture. America was fortunate enough to be the richest country on earth during the 20th century, so it developed a car culture sooner and more pervasively than any other country. At a time when cars were an unaffordable luxury for most Europeans, many Americans regarded cars as a basic necessity.
The public discourse about cycling in America is dominated by myths, because very few Americans have practical experience of regular cycling. Those who do cycle tend to be self-taught, because of the limited availability of cycle training and the lack of a strong tradition of club cycling. America is having to rebuild a culture of cycling from scratch, for no other reason than the ubiquity of the motorcar.