I don&#x27;t think it would have been political suicide. The program was (presumably, I don&#x27;t know the exact history) classified so the vast majority of people didn&#x27;t know about it, and people who did wouldn&#x27;t be able to talk about it publicly. It likely wouldn&#x27;t have come out before his next election. Despite dropping the bomb he was very unpopular and wasn&#x27;t expected to win a second term. Also, several of his top generals (Eisenhower and MacArthur) weren&#x27;t in favor of using the bomb, and people have a tendency to rationalize whatever authority figures choose so people may very well have defended Truman as strongly as they do today.