Is there an answer?

Perceptive quote from the ex-Mayor of Ferguson, the American town which is currently infamous for the shooting dead of a black youth by a white police officer, leading to accusations of racism - and worse. "Sure we're segregated. Most cities are. People want to be with people that look like them, think like them, talk like them. It's human nature.  It doesn't mean it's bad" And he's right - segregation in and of itself is neither good nor bad - it's just the way things tend to be.  Just think of the way there are small areas of the Costa del Sol which are predominantly populated by Brits.  Segregation only becomes a problem when it leads to isolationism, which in turn leads on both sides to a "them and us" mentality.  And that unfortunately happens all too easily.  So then it becomes a sort of "chicken and egg" problem.  Which is the cause and which the effect?