TOKYO — The violent hit to the defenseless quarterback came from behind, after the first play of a game between two storied college football teams. Ordinarily, the illegal tackle would have simply drawn a severe penalty. But it happened in Japan, where the play — and what led to it — has touched off nationwide examination of deep-rooted cultural dynamics, including what the Japanese call “power hara,” or harassment by those in power who force underlings to do things against their will.・・・・(まだまだ続く)