Of course these are just extensions of our own personal hatreds and prejudices. The best way to change them is to change these feelings within yourself.
This I totally disagree with. Saying there's no evident solution for a problem is one thing, stating that the problem is actually "imagined" or just has something to do with our perception is a totally different thing.
I believe in cultural relativism only weakly, I firmly believe there are well-defined wrongs: female circumcision is wrong (http://www.nytimes.com/2011/05/12/opinion/12kristof.html?_r=...), putting your own citizens in concentration camps is wrong, etc. To say that these acts are unequivocally wrong has nothing to do with "our own personal hatreds and prejudices".
Um, I didn't say the problem was imagined. I said the problem on a macro scale is just the extension of behaviours on a micro scale.
In other words: the best way to change the world is to change the person looking back at you in the mirror. The extension of your hatred, your desire for revenge, your jealousy, your moral outrage is all these things you are complaining about.
Of course these are just extensions of our own personal hatreds and prejudices. The best way to change them is to change these feelings within yourself.