Why in his later years did Martin Luther claim that the Jews were devils and blasphemers?

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In his later years, Martin Luther became increasingly frustrated with the fact that Jews were not converting to his form of Christianity in significant numbers. He believed that the Jews were rejecting the true faith and instead following their own blasphemous beliefs. This frustration led him to write several tracts in which he portrayed the Jews as devils and murderers, further fueling anti-Semitic sentiment among his followers.

Why in His Later Years Did Martin Luther Claim That