In this note: HIGHLY recommend “Rigor of Angels”, which (in part) details Heisenbergs life and his moral qualms about building a bomb. He just wanted to be left alone and perfect his science, and it’s really interesting to see how such a laudable motivation can be turned to such deplorable, unforgivable (IMO) ends.

Long story short they claim they thought the bomb was impossible, but it was still a large matter of concern for him as he worked on nuclear power. The most interesting tidbit was that Heisenberg was in a small way responsible for (west) Germany’s ongoing ban on nuclear weapons, which is a slight redemption arc.