To activists of good faith who may have been taken in by duplicitous representations of the movement, I would say only that there are too many noble causes in need of assistance to allow oneself to be enlisted in a dubious one. Those worthy causes include fighting the jihadist decapitators, saving the women and girls enslaved by Boko Haram, defending the Middle East’s imperiled Christians and Arab democrats, and, of course, striving for a just peace between Israelis and Palestinians.