I don't think you'll find anyone that disagrees that that should be humanity's goal, but the reality is that we do have expansionist countries (china, japan), psycho dictators (hitler, hussein, castro, mao, etc), and extreme fundamentalist governments (taliban, etc), and as you say, we still do have racism.
The utopian view of society requires that most people cooperate, and in turn, ignore their core nature and instincts, which, in my opinion, is not likely to happen.