I guess I would take a shot at this.
If God wants to get rid of all prejudice and hatred, he could; but that will take away our free will as well. Personally, I'd like to think that the world is a workshop and God has given us all the tools necessary to make this world perfect. The rest will depend on us. If God has made the world perfect in the first place, what work is there left for us? Our lives shall then lack purpose. Why would you then ever want to become a man of cloth if there is no work needs to be done?