Even the Nazis weren't completely scrubbed.
I think you might have a hard time defining the Palestinians as a "worldwide scourge". Theirs is really a local conflict.
But, to actually site some "scourges" with greater dimensions, you see neither Carthaginians, nor Mongol Hordes anymore. Babylonians and Aztecs are also hard to come by nowadays.
Obviously if the Nazis won, they wouldn't have seen themselves as a "scourge". So the victor writes the history.
Only the Chinese come close to writing an unbroken history as long the Jews. To mention a few others who have tried to beat them over time, you will also have a tough time finding Romans, Phoenicians, or Assyrians. I do agree that the Palis probably don't have much staying power.