People are people, and all people have emotions and biases, rarely understood: intellectual and emotional behavior don't necessarily have an inverse correlation. Oppenheimer, as superhuman and wise as he was in so many ways, was still a human being. Depending upon the occasion he could be as human (dramatic, overwhelming, megalomaniacal, self-serving, and even downright dishonest, as his arch-rival Edward Teller was accused of being, and was) as most of us. Like most of us, depending upon the circumstances, he could change his personality and alleged beliefs at the drop of a hat.
F*** You! Mr. President: Confessions of the Father of the Neutron Bomb (2006)