While I take offense at the insinuation that conservatives in general would want to segregate, I'll ignore that for the sake of discussion. I think the turtle thing was just to summarize, in a rather silly way, how his findings showed that, generally in America, diversity led to people keeping to themselves. The point of the article wasn't to explain that this is how all countries work, just how the majority of America seems to work. I, myself, would be rather interested in seeing how this goes in Canada or Europe. I don't think he believes that we've failed in creating diverse communities, just that we need to modify our methods a bit. Scientists have also found that babies are racist, so there is something to be said as far as this being a normal thing, if not entirely desirable.