I just found this unexpectedly lucid quote from Adolf Hitler when someone asked him why he was so anti-Semitic, when the Jews had benefitted Germany so much: “It is manifestly clear and has been proven in practice and by the facts of all revolutions that a struggle for ideals, for improvements of any kind whatsoever, absolutely must be supplemented with a struggle against some social class or caste.”
What makes it so creepy is that he said it in 1922, which must have been about the last moment in his career when he could afford to be truthful to a journalist. Of course, anyone following that line of reasoning in Europe today would use the Muslims for their enemies. The parallel is by no means exact, but it’s close enough to be worrying.