Only a communist was capable of create something this dangerous

I got the impression that he was probably more gung-ho about the Manhattan Project with threat of competition with the Nazis on his mind. It's a deterrent, and he felt a desperate war-torn German Reich would use it indiscriminately. He considered the Soviets allies at the time, which they were in the war, and he didn't seem rabid about Japan at all—though he should have been. They were ruthless, loyal and committed to their emperor to the last. Their pilots crashed into enemy targets to bolster mission success and impact. Their soldiers Hari-Kari upon failure or capture. Civilians were trained in combat, including women and children. Surrender by land invasion was not a guaranteed successful outcome. It would be a very costly decision. I think things played out reasonably well. Truman made the right call.

Regarding Communism, there's nothing inherently evil about an early 20th Century mainstream political theory (barely tested) which fell out of favor later on. Obviously our society here in the West has a way of pressuring it's citizenry to conform. I personally think the American system of divided government and free enterprise is the way to go, but I would never deny the possibility that future civilizations of the globe will probably try different things with various levels of success. Some of those may even be authoritarian in nature, but I hope not. If it takes hold, hopefully it comes from a good place with humanitarian results.

Dr. Oppenheimer seems to have been portrayed as a flawed anti-hero in the film, and perhaps can be seen that way in real life, too. I personally found more to like about a few other characters (like his hometown New York Jewish friend) but I sure had a big smile on my face during the test detonation. I take it you have qualms about his character, morality, and perhaps ego?

I am pretty much convinced you 2 are hired trolls to do this on social media.