Man's inhumanity to man is appalling, disgusting, and very frightening! Hatred, violence, experimentation, and murder all because of another person's race, ethnicity, or religion, can inspire terror. If "they" will do that to "them", I must be next! No wonder people bury their heads in the sand and refuse to acknowledge what has been done to our fellow human beings in the name of "superiority." Fear of the "other" has driven those in authority mad!
What can be done to make a difference? First, acknowledging the wrong-doing. Second, educating yourself about the history and culture of the people you fear. Third, listen to their history, their needs, their dreams. Fourth, get involved in helping "others" achieve their dreams. Fifth, become an advocate for them among your peers. There are probably more, but that's all I have right now.