I agree with that point. I cannot know why, but nonetheless I am sharing my insights, flawed though they may be.
[Passion plays whipped Hitler's Germany into genocidal frenzy] ... weelll that would be an unfortunate oversimplification of a very complex situation; in any case, the Holocaust, Hitler, the Nazis, et al have been discredited and soundly denounced by just about everyone on the planet since 1945. Justifiably so.
Yet there are holocaust-deniers. If the underlying evil of Nazism is not well and truly dead, then there is a chance that re-enactments of the Passion may do again what it has (supposedly) done before. Can we sit here and guarantee to every Jew on the planet that nothing could bring back that evil? Or a different, perhaps more insidious, evil?
My opinion is that there is zero chance of a significant negative effect in the USA. I love Eastern Europe, but don't kid yourself. A Rumanian Christian girl told me "so many there hate Jews."