In my opinion, until everyone on Earth learns to get along with each other, there is no way we are ever going to be able to get along with extraterrestrials. Imagine any one of the racist people you may know, or have heard of, meeting someone from another planet. It could very well be that we have already been visited by an advanced extraterrestrial race, who observed us, and decided that we ere too uncivilized to bother with.