According to the source of Mr Wear,
Remy, Steven P., The Malmedy Massacre: The War Crimes Trial Controversy, Cambridge, MA: Harvard University Press, 2017, p. 134.
Warren Magee was nothing more than one of the many defense lawyers who stooped to anti Semitic memes in an attempt to explain their courtroom defeats. Here is the part Mr Wear left out:
An analysis of the trial written for Pope Pius XII by the America lawyer Warren Magee offers insight into the conspiratorial anti Semitism animating this fear of Jewish revenge. […]
But for him, Everett and other American and German anti Semites intent on discrediting all Allied war crimes trials and reversing the growing number of guilty verdicts, the real problem was not a single prosecutor or interrogator, but a conspiracy to exact vengeance. The challenge for Everett and the others, then, would be to reveal the conspiracy to military and political officials and the wider public.
Of course, there was no Jewish revenge conspiracy.