Humans inherently think in “Me up – You down” terms. We are innately tribal, and somewhat hostile to “the other”. That proclivity has created not only tribal strife, but war, sport, and many other human traits. It is universal and cannot be overcome….except by religious self denial. Non-caucasians have yet to learn this lesson, by and large.
See: http://www.spiegel.de/international/europe/europe-failing-to-protect-roma-from-discrimination-and-poverty-a-942057.html