Of course I am. And so were the great scientists of that period. They had the example of the failure of the League of Nations. All the Europeans (and especially the Jews) knew how deep the hatreds and divisions ran. But they were desperate. Atomic arms raised the stakes too high.
My purpose, again, is to try to present the mind-set of these scientists. I believe if they co-operated or urged co-operation with the Russians it was this desperation which motivated them - not naive beliefs about the beauties of Soviet Communism.