As a japanese living in Tokyo and my best friend works for Nissan. Japanese people have drowned many foreigners in the past who became big. If you have worked for a japanese company you would know, as soon as you start becoming bigger and start getting promotion there will be 4-5 people trying to bring you down. Now Image being CEO of Nissan it was this man against whole Nissan. They got the better of him. To bring this man down they aligned with government and that was it.
Why he actually was wanted (spoilers included)