Some people do, that's true. It also seems to be true that some people have an assumption, not at all completely grounded in fact, that "all" people can and will develop "like we did". Two problems I see with this belief are that it is inherently speculative (a prediction of the future), and it assumes that other cultures Necessarily* _want_ to develop like we have. Personally, I believe there are significant imperfections in Western culture, the way we've developed and the way we operate today, I'd be extremely surprised if all cultures view our way as the best way to organize societies. You can see evidence of this all over the place, but Westerners have a habit of classifying dissenting opinions as "just wrong" and dismissing/ignoring them.