<< The US had just been through [Five] years of [The Roosevelt] war and [Eight years of the Roosevelt] depression, had no stomach for what it would take to defeat Stalin and Mao. >>
What absolute bloody rubbish!
Roosevelt surrendered all of Eastern Europe and millions of Soviet subjects into slavery because he was ill and dying and essentially incapacitated [And knew it when he ran for his fourth term as president] and because the Department of State and much of his administration was hugely influenced by their substantial infiltration of Soviet agents.
[Churchill was there but was by then not much more than an elderly drunkard, unable to handle Stalin -- and Roosevelt's malevolent Soviet agents -- on his own]
On his death, all of Roosevelt's Soviet agents were taken over by, acknowledged and tolerated by, increased in number and influence and allowed to dictate and/or direct the direction subsequently taken by by Truman and his mobbed-up "administration."
And as for Mao?
Truman's perfidious incompetence -- and his Soviets -- hadn't yet even created, enabled and facilitated that most evil of all of Human History's long succession of monstrous, mass-murdering, child-rapist, evil, bastards!
Not really accurate. HST had it within his capacity to reveal to the nation the extent to which there was leftist influence within the FDR administration and if he did that, the politial climate would have changed.
He probably chose not to do that because of intra-party loyalty or fear of intra party revenge attacks that would respond to such a leveling with the american public.
That was a direction that would have been open to him, and would have been traumatic, but also would have created the will to take steps that would have prevented the development of the Red Nuclear program.
I think the Korean point is the best. The invasion of the South was based on a calculation of what Truman would do, and they clearly detremined that he would not respond effectively.
This alternative history stuff is just speculation, of course, so I dont want to fault HST too much. The point is that his reasons for not being more effective in countering the Reds when we were the only nuclear power, are not as compelling as some want to claim. The larceny of our nuclear secrets by the Rosenbergs and others, would be the template for the public revelations.