Why did the US occupation of Japan focus on shaping Japan as a democratic member of the Western bloc?
The initial purpose of occupation of Japan by the Allies was the disarmament of Japan, but that shifted to include shaping Japan as a member of the Western block and a democracy. Why was the purpose preventing Japan from turning to socialism?
There were two reasons for this.
First of all, the US believed that a democratic Japan would be much less likely to ever become a military threat again. The US believed that the war had been brought on by the structure of government under the Meiji constitution that allowed the military to have so much power over the civilian government. By making Japan a democracy, the US felt it could avoid having this happen again.
The second reason is the Cold War. With the spread of communism in East Asia, the US feared that Japan might be next. Therefore, it focused heavily on briging Japan into the Western bloc to serve as an outpost of American power.
For these reasons, the US wanted very much to make Japan a democratic country and a member of the Western bloc.