Every one of them. It would be politically suicidal not to end the war as soon as possible (even if no invasion were required).
Although many people assume that Henry Wallace would not have used nuclear weapons had he been in Truman's place, in fact he never criticized Truman's decision to drop the bomb.
"'I just don't remember how I felt at the time,' Wallace later commented. 'Perhaps these massive events maybe numbed me — I just don't know what it is.' He was 'terrifically interested' in the atomic bomb project, he said, but his primary concern, was 'that the darn thing went off.'
"To his credit, Wallace did not criticize — either then or later, publicly or privately — Truman's decision. Present at the inception of the project, Wallace had helped persuade Roosevelt 'it was something to put money into.' To have second-guessed Truman when the weapon was actually used would have been intellectually dishonest..." John C. Culver and John Hyde,
American Dreamer: A Life of Henry A. Wallace, pp. 396-7.
https://books.google.com/books?id=rgp2CQAAQBAJ&pg=PA396