Another problem: I think Parade probably made gentile audiences very uncomfortable. Depictions of anti-Semitism in a work like Cabaret, for example, is easier to digest, because it's set in Berlin in the 1930s, and gentile audiences can say, oh, how terrible, and feel comfortably removed from culpability. The depiction of the latent anti-Semitism of the Deep South (and America by a larger token), is much harder to dismiss. Such images as the townspeople performing a jubilant cakewalk as Frank is unaccountably found guilty, or the virulence of such numbers as "Where Will You Stand When the Flood Comes?" and "That's What He Said" or the depiction of Frank's lynching were also similarly unsettling. It's all a part of the underside of America's history, but I can understand if non-Jews found Parade tough going.
"Gif me the cobra jool!"