The authors of that pacifist line of bilge were Roosevelt's State hacks, notably Dean Acheson, who gradually changed his policy from one of appeasement of Stalin to containment of the Soviet menace that later proved to be very real.
>>>There was a mentality in the FDR State Department that Russia was not a communist hegemon
Many in the FDR State Department were open communists, and were cheer-leaders for Stalin and his regime. They were the people whom Joe McCarthy was trying to remove in the early 1950s. The FDR administration had the highest infiltration of KNOWN communists of any adminstration in American history. Membership of the Communist Party USA, could not deny you a government job with high security clearance.
How else can you explain how America’s greatest secret, the plans of the atomic bomb, found their way into Soviet hands? Communists were also heavily represented in the mainstream media, as is the case today. When McCarthy tried to remove the communists in the State Department, the media attacked McCarthy, not the communists. It was a case of the commies defending their own.