I don't know the in's and out's of Japanese politics, and what had led the poor guy to assassinate the former Prime Minister, Shinzo Abe. What I will comment about, is the failure of the security detail to protect the former Prime Minister. Which led to him being killed.
I have seen the video, that NDTV had acquired. As you can see, there was a first shot. And the former PM have even saw his assassin. Then there was the second, as you can see, Abe hold his neck and fell down.
I'm no security expert. I'm a jobless bum. But it is very clear, there is something wrong in the execution of duty, by the security detail. First is, not securing the perimeter. Shinzo Abe is not just a mere politician, he is a former Prime Minister, head of Government of Japan. How can that man, came so close to the former PM. In the US, former presidents are still under the protection of the Secret Service. Again I don't know about Japan, there are bodyguards, but they definitely failed in protecting Abe.
Second, there was a first shot. Abe even looked back to see the commotion. It's right to apprehend the assassin. But shouldn't have they secured Abe? They just let him stood there, until the second shot happened, and Abe fell down. What should have they done, is after that first shot, take Abe away to some secure spot, while it is happening, disarmed that assassin. If they have done that, the former Prime Minister may have been be still with us.
I don't know what will be the implications, of a former politician dying by a gunshot in Japan's politics. Philippines has also it's own episodes of assassinations too. And Filipino's are still polarized if his death, have done good or bad for the country. It had cause a revolution, and toppled Ferdinand Marcos. His wife become President, and also his son 3 decades after that. The only weird thing is, just one full presidential term away. The son of Ferdinand Marcos, became President. They are only separated by Rodrigo Duterte. Yes, if you don't know yet, I am talking about Ninoy Aquino. Whose name might be removed in the airport, in which he was assassinated. Just like Abe, a behind the back shooting.
Again I don't know about the implications, but there will be. In the Philippines, we are feeling the results of the assassination of Ninoy. In the worldwide sense, Gavrilo Princip killing Archduke Francis Ferdinand, launch World War 1, in which leads to the establishment of Communism in Russia, by the help of the Germans. Fascism, because of the unfair treatment of Italy, despite being with Allies. Nazism, because of the unfair and heavy punishment on Germany. And also, Imperial Japan. All of those led us to World War 2, to the Cold War Era, and the wars inside of it, Korea, Vietnam, Afghanistan, African wars. To the Gulf War era, Yugoslav wars, 911, Iraq, Afghanistan, ISIS, to the present Russia-Ukraine conflict. All because a Serbian, assassinated an Austrian Monarch. There will be implications. I just don't how big or small it is.