Why in his later year did martin luther claim the jewa were devils and blaspherers

While there will be never consensus regarding this, most scholars agree with Michael Berenbaum's view that Luther was concerned with the Jewish question all his life, despite devoting only a small proportion of his work to it. As a Christian pastor and theologian Luther was concerned that people have faith in Jesus as the messiah for salvation. In rejecting that view of Jesus, the Jews became the quintessential other; a model of the opposition to the Christian view of God. In an early work, That Jesus Christ was born a Jew, Luther advocated kindness toward the Jews, but only with the aim of converting them to Christianity: what was called Judenmission. When his efforts at conversion failed, he became increasingly bitter toward them