I think that the thing we Europeans (and us Brits in particular) often fail to grasp is that the USA is a very foreign country. I love my visits there and my US friends but it does not take a long stay for you to run into things that seem "incomprehensible" and you start saying to yourself "that cant be right".
However it works the other way too. We fail to deal properly with things like the right to free speech - and our USA cousins find that pretty incomprehensible - surely a fundamental freedom.
There are some huge cultural differences - made more difficult sometimes to understand because of the vast common components of shared culture.