https://youtu.be/grqtxI_MJC0

(History Channel: Japan under American Occupation)

From 1945 to 1952, U.S. military ruled Japan. South Korea was occupied

by U.S. military from 1945 to 1948. 

For historian John W. Dower, 

Even Japanese peace activists who endorse the ideals of the Nuremberg and Tokyo charters,

and who have labored to document and publicize Japanese atrocities, cannot defend the American

decision to exonerate the emperor of war responsibility and then, in the chill of Cold war, release

and soon afterwards openly embrace accused right-wing war criminals like the later prime minister 

Kishi Nobusuke.^[48]

In retrospect, apart from the military officer corps, the purge of alleged militarists and ultranationalists

that was conducted under the Occupation had relatively small impact on the long-term composition

of men of influence in the public and private sectors. The purge initially brought new blood into the

political parties, but this was offset by the return of huge numbers of formally purged conservative

politicians to national as well as local politics in the early 1950s. In the bureaucracy, the purge was

negligible from the outset.... In the economic sector, the purge similarly was only mildly disruptive,

affecting less than sixteen hundred individuals spread among some four hundred companies. Everywhere

one looks, the corridors of power in postwar Japan are crowded with men whose talents had already been

recognized during the war years, and who found the same talents highly prized in the "new" Japan.^[49]

                    - from Wikidepia

                    일본제국주의 시대에 일본에서 일했던 관리들을 미군정이 일본에서 중용한것처럼 남한에서도 미군정은 

                     일제강점기에 조선에서 일했던 인재들을 분별없이 다시 등용했다. 똑같은 정책기조였다. 미국은 남한을 

                     패전국의 식민지 즉 영토의 일부로 취급했고  일본의 구관들은 같은 일본사람들이었든 반면에, 조선사람 

                    들에게는 일본은  정복자였고 그들과 협조한 구관들을 용납하지 않았다. 남한에서는 이들을 적에게 협조한 

                     친일파라고 부른다.