There is something perverse and masochistic about a self-described "pro-Israel" group going out of its way to lend support to the airing of luridly anti-Semitic propaganda. But that's what happened last month when J Street - the "pro-Israel, pro-peace" lobby - endorsed the performance of Seven Jewish Children, an outrageous, 10-minute screed written by British playwright Caryl Churchill, originally performed in London and now being produced in cities across the US.

Seven Jewish Children draws a direct line from Nazi Germany's mass-murder of European Jewry to Israel's treatment of the Palestinians, an old trope in the quiver of rabid Israel-haters. Rushing through 60 years of history, it depicts a group of adults speaking in hushed tones about how they ought to address...