Bear in mind that economic strife is one of the main causes of discrimination, because people love a scapegoat. The Great Depression gave us the Nazis, and the current recession has seen the birth of some similar groups on the right with worryingly ill-defined ideologies and emphasis on personality, the Tea Party being the main example. Things aren't so bad at the moment. If they do go very bad in the future, and I think they probably will, you can count on people forgetting the lessons of the past.