I guess Hitler was not available, so they went with the antisemite who inspired Hitler.
You’ll recall that Hitler was Roman Catholic, not Lutheran.
Antisemitism was not uncommon in Germany back in Luther’s time, or Europe in General. Look up Johann Eck-he was a staunch Catholic, adversary of Luther and the Reformation, and virulent ant-semite himself. In 1541 he published “Against the Defense of the Jews “(German: Ains Juden-büechlins Verlegung). In it he opposes the position of the Nuremberg reformer Andreas Osiander,who sought to refute medieval superstition that Jews murdered Christian children, desecrated the eucharistic Host, and poisoned wells. Eck called Osiander a “Jew-protector” and “Jew-father”, and no fewer than nineteen times reviled the Jews, and called them “a blasphemous race”.
And since you want to find someone to blame, you should not leave out Rome against the Jews.