Abe was the target of many in the West for a number of reasons, first and foremost Abe was an opponent of the MacArthur Constitution and a was committed Japanese nationalist. Whether it was Abenomics, a continuation of Japan’s export economy coupled with a program for prosperity for all classes in Japan, or the goal of a strong and independent Japan acting as a normal power in the world, the globalist left, Conservatism Inc., and even the Alt-Right, hated Abe.
First, and foremost, Globohomo hated Abe who restricted immigration, supported the ideal of the Japanese nation and people in an explicitly racial manner, and planned a remilitarized and nuclear armed Japan. Immigration is the core issue. Globohomo wanted Japan opened to mass immigration, but Abe wanted Japan to remain Japanese, not just linguistically and culturally, but racially.