make them to appear less human, even as animals or monsters. If people are viewed as the dangerous enemies threatening your family and "stealing" your job, then it's easier to hate them.
Unfortunately we see it here on DU sometimes in threads about H1B visas or immigration or who is a real American. Some folks have economic anxiety and talk about a fair playing field for jobs. Others slip down the slope of sharing juicy details about Indian people they got from white supremacist websites while insisting they are not personally racist. 
No matter how educated people are, they still can't seem to understand how slavery could have happened, or the holocaust, or the massacres in the Balkans or Rwanda, or the mass shootings here in America even now.
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