As stated, your perspective is understandably one-sided.
But that does not mean other perspectives do not exist or are completely invalid.
Members of distinctive groups often identify themselves with those groups, and then to justify, rationalize and ignore the bad behavior of other members of their particular group while obsessing about the inherently evil nature of any opponents of their group.
Generally speaking, it’s tough for group members to view the history of their own group and its opponents objectively.
Very human and very understandable. Carried to its logical conclusion, you get the Holocaust.