I'm not saying we should ignore such things. I'm not saying they were right.
But think about the reasons why such atrocities could be committed in the first place. Jews were persecuted for centuries because of their denunciation of Jesus. And the Church was a leader in these persecutions. This set the stage for the rampant anti-semitism of the Nazis.
The American minorities, primarily African-Americans, were kept in slavery and regarded as less than human by pious men quoting the Bible, such as Leviticus 25:44-46