Trope about bad guys? Nazi Germany and Imperial Japan worked hard to get the atom bomb. If the 'bad guys' had created it first, would the world be a better place?
The bad guys _did_ get it first. If Germany or Japan developed it first, they would be sure to go down as the "good guys" in the history textbooks, and you'd be on hackernews wondering how awful it would be if the demonic United States of America developed it first.
This comment shows either an incredible ignorance of history or a pathological view of right and wrong. Nazi Germany was exterminating whole races in the millions. Imperial Japan was doing the same, averaging 100,000 dead Chinese, Koreans and Vietnamese PER MONTH for over 8 years. Tokyo newspapers regularly published head counts for officers who were in head chopping contests of villagers in areas where the population needed to be suppressed. They would roll into a village and just start lining up people to cut off their heads. The Rape of Nanking by itself stands out as one of the most brutal events of the war.
The US isn't perfect but to say it was the "bad guy" in the war isn't an argument supported by anyone's facts.