I think the diversity is a good thing we just need to settle down, like TheHex said hating each other is just human nature, we hate our own family, we fight with our friends, we kill our kind just like any other kind, yet through it all we still have a conscience and try to keep our minds quite and our hearts at ease(thank god for weed). I read an interesting article that proposed the possibility that the different races actually developed from different species of primates so it wouldn't really matter if the continents hadn't split. Come to think of it if they hadn't split we woulda prob killed our selves before we got the chance to settle down.