There is always a possibility, indeed probability, that isolated individuals may use the "Passion" as an excuse to vandalize and "revenge" in the name of Jesus, but if Mel Gibson really captured the spirit of the Gospels, everyone will leave the movie heartbroken, but humbled and forgiving.
Jesus was Jewish. The Apostles were Jewish. First Christians were Jewish. Two thirds of our Bible is Judaic, and all of it is Jewish. Anti-semitism cannot proceed from the Gosples. The message of the Gospels is love, forgivness and hope. Only wicked human nature can find fuel for hatred in the Gospels.