You think Leo Szilard and the other great scientists who shared his view were fools? You don't place different values on opinions according to the experience and ability of those who express them?
Your arguments can also be reversed. Who's to say that sharing atomic secrets with the Soviets was sure to be catastrophic to our interests? Perhaps the Rosenbergs were right? I'm sure you don't like that line of reasoning.
I do not defend all American actions, but I do defend the American character. In the last century, the number of functioning democracies in the world has increased from about twenty to over a hundred. This has mostly occurred due to the example of the UK and the U.S. It has been a messy process, and not every action has been wise or correct. But we remain the countries that the individual people of the world want to emulate. Our politics and economies remain the jewels of the political world. For this reason alone I am a patriot. It is not an accident that we have had no wars with established democracies.