There is a famous passion play at Oberammergau which is held every 10 years.It was exploted by the Nazis, but it certainly did not cause the Holocaust. Well, it certainly seems to contradict your sentence above that one has to reach back to the middle ages....doesn't it? Even if it was "exploited" by the Nazis, it did result in anti-Jewish action. Did the anti-Jewish action occur in a vacuum?
Be that as it may, obviously, one play didn't "cause" the Holocaust. What did, in your opinion?
I said that one has to reach back to the Middles ages to find an example of Christians who were incited to violence against the Jews by a passion play. As for the Holocaust, only two things were required. An implacable and inexplicable hatred of Jews by Hitler and the opportunity afforded by conditions of total war.