Read the Szilard interview carefully. Do you think he's unaware of who the Soviets were? Of who the Japanese were? Of who the Germans were? Of who we were?
He made his decisions very carefully - and he certainly did not betray his country or intend to betray it. He came to different conclusions than you about how to advance it's interests. That's very different. All the difference in the world.
Dr. Szilard wasn't all that " brilliant " about a lot of things. He had, many years prior to the Manhattam project, figured out the rudiments of A-Bomb. He wrote it all down and then did nothing much with it. Much of his life, both scientific and other, was like that. He was a sacastic man, had a biting sense of " humor ", and, from boyhood, had a wish to save the world. He was also something of an eccentric and NO, he did NOT really understand politics, the Russians, nor have a " clearer and better view of the world than you and I ". You only assume this to be a fact.