An Israeli heavyweight judoka named Or Sasson defeated an Egyptian opponent named Islam El Shehaby Friday in a first-round match at the Rio Olympics. The Egyptian refused to shake his opponent’s extended hand, earning boos from the crowd. Mr. Sasson went on to win a bronze medal.

If you want the short answer for why the Arab world is sliding into the abyss, look no further than this little incident. It did itself in chiefly through its long-abiding and all-consuming hatred of Israel, and of Jews.

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