Personally, I think the whole image of the 'Average American' is every bit as much as the creation of the Media as many American perceptions of other countries are. Y'see, that's the whole problem, there is no such thing as an 'average' American any more than an 'average' Brazilian, or any other countryman on the planet. Bias is everywhere, that's the whole problem, people tend towards what suits them best both personally and socially.
People say that people of a like mind cluster together, but it's probably closer to the truth to say that people clustered together end up of a like mind. The thing is, with somewhere like the US, there is room for, and largely exists, the entire Spectrum of standpoints, so there's little point trying to put them into a box, yes there's groups that make perfect media images of 'gung-ho' Hard-line Christian America, but they are not 'average' any more than an Evolution-believing, Atheistic City-dweller is.
EDIT : And, in the hope of getting this thread back on course before it veers off wildly, the concern here in London at the moment is the approaching Funeral Tomorrow and Marathon on Sunday, people are, without a motive, left wondering about their own safety, it's a very human reaction.