From his writings, Shalett uses a mixed tone of happiness and bitterness to explain what he thinks of this event: President Truman's announcement “was an element of euphoria in the realization that we had perfected this weapon of devastation to use against an enemy who had started war […], but it was a dark euphoria.” Shalett uses the word "euphoria" to describe his positive tone about the bomb being able to end the war, but his tone changes slightly to bitterness later when he uses the words "somber euphoria". These words show that Shalett has some negative emotions regarding some problems that may occur for owning this destructible weapon. Thus, Shalett further emphasizes that the United States “made people reflect on the enormous responsibility involved” in what it did next to Japan. In this part, Shalett's tone changes slightly and becomes more demanding; applies his tone through the words “sobering awareness” as a warning to be careful about the outcome that will happen after the war. The words “sobering awareness” probably portend that some conflicts may occur after the war – such as the onset of the Cold War. Overall in the article, Shalett uses a cautionary tone about how this new weapon could cause some problems later. In the last two quotes, his tone of happiness is about the change of the new weapon, the momentum of the war changes to a cautious tone about how this weapon can create more problems in the US.