In the preface, the editors of the American Edition of Luther’s works write
The fact that Luther, during the last years of his life, wrote treatises harshly condemnatory of the Jews and Judaism is rather widely known. The treatises themselves, however, have not previously been available in English. The publication here of the longest and most infamous of them, On the Jews and Their Lies, will no doubt prove dismaying to many readers, not only because it shows Luther at his least attractive, but also because of the potential misuse of this material. The risk to Luther’s reputation is gladly borne, since the exposure of a broader range of his writings to modern critical judgment is an inherent purpose of this American edition. However, the thought of possible misuse of this material, to the detriment either of the Jewish people or of Jewish-Christian relations today, has occasioned great misgivings. Both editor and publisher, therefore, wish to make clear at the very outset that publication of this treatise is being undertaken only to make available the necessary documents for scholarly study of this aspect of Luther’s thought, which has played so fateful a role in the development of anti-Semitism in Western culture. Such publication is in no way intended as an endorsement of the distorted views of Jewish faith and practice or the defamation of the Jewish people which this treatise contains.*
Luther’s book doesn’t just make us squirm today, it was also viewed negatively in Luther’s own day, among his own supporters!
Already upon its first appearance in the year 1543, Luther’s treatise caused widespread dismay, not only among contemporary Jews but also in Protestant circles. Melanchthon and Osiander are known to have been unhappy with its severity. Henry Bullinger, in correspondence with Martin Bucer, remarked that Luther’s views reminded him of those of the Inquisitors. And a subsequent document prepared by the churches of Zurich declared (speaking specifically of the treatise Vom Schem Hamphoras, published later in 1543), that “if it had been written by a swineherd, rather than by a celebrated shepherd of souls, it might have some—but very little—justification.”* [The Zurich document is cited in WA 53, 574. For the views of Melanchthon, Osiander, Bullinger, and other Reformers, see Lewin, Luthers Stellung zu den Juden (cited above, p. 96, n. 35), pp. 97 ff.]
*Luther’s works, vol. 47: The Christian in Society IV.