Those who today label Israel the font of all evil use Hitler's rationale to relieve guilt over Hitler. That's why the same protesters in Frankfurt threatening Jews carried posters comparing Israel to the Nazis: If Jews are the new Nazis, fighting the Jews becomes an obligation.
Every Passover, Jews recite a paragraph: "in every generation they rise against us to destroy us; and the Holy One, blessed be He, saves us from their hand!" The names change, but the rationale does not. And the God of Israel is always watching, even if those who attack the Jews have convinced themselves that He will turn a blind eye.