I have seen this demonstrated again and again in my life.
Oh, how easy it is to lead humans into thinking that it's good to murder and destroy whole countries full of people if they're different enough from them. Bombing, burning, raping, torturing, and so on... All popular and easy things to convince one country full of people to do to another country full of people if you can convince them of how DIFFERENT the other is, of how DANGEROUS that makes the other.