Sapphire writes...

In the episode Heritage Goliath tells Angela "What humans fear they seek to destroy" Throughout recoded history fear has never been the cause of racism, arrogance has. Hitler's arrogance about a master race has led to the deaths of millions of innocent Jews of whom he saw as inferior. Hitler wasn't scared of Jews but he was jealous of their wealth. The Ku Klux Klan has a long history of terrorizing black people living in the deep south, but they did it out of their misguided arrogance of the belief that white people are superior, they didn't do it out of fear. Besides in reality if humanity ever discovered another race living on earth beside our own, the overwealming majority of humans would be curious not fearful.