Top down: Prime Minister Shinzo Abe has been part of a rightward lean at the top of Japan's political structures. | REUTERS Prime Minister Shinzo Abe is Japan's most ideological postwar prime minister, pushing right-wing policies on numerous fronts that trample on postwar norms and values. He has been able to do so because he has the Diet in his back pocket, but how did this tectonic shift in Japa