Humanity often has periods of instability following major discoveries that unseat orthodox ideals. An argument can be made that much of the cultural instability in the modern US and its animosity to science can be rooted in an "allergic" reaction to the ideas of evolution and a greater understanding of just how old and vast our universe actually is.

Personally, such an argument would be a bit simplistic, but you'd be a fool to ignore how discombobulating evolution has been to much of Evangelical America. People who believe they are the center of universe tend to find it difficult to accept evidence to the contrary. To use another literary reference, there are a lot of warty bliggens in the world.