Could it be that the evidence the kids are presented is less than compelling. One has to reach back into the Middle Ages to show that a Passion play resultd in anti-Jewish actions. As for the role of the Jews historicallly, I am surprised that people have not pointed out that Paul was similiarly attacked by the Jewish leadership and was saved only because he was a Roman citizen. The Book of Acts devotes several chapters to this.
I thought there was a Passion Play in the 1930's in Germany.