it is the incidents/differences/races etc that make human become aware and see the need to come together as one ... call it the irony of life or the paradox of life ... 

a wild idea from you statement ... how abt this "weird"/"controversial" take ... 

since the film tries to claim that everyone is to some extent "racist" (dep on the situation you are thrown into and the experiences you have had) ... people are ALL HOPELESSLY SIMILAR, so that BINDS US TOGETHER because HEY, WE ARE ALL NOT SO DIFFERENT despite our DIFFERENCES in race, etc ... what a line of argument ... hee hee