Just to be clear, "The Making of the Atomic Bomb" is about the lead up to and the making of the atomic bomb. It is not about Oppenheimer though it does go into great detail about all the major players.
20 year olds shouldn't be considered culpable for attempted murder now? Madness.
This is an important biographical detail not only because attempted murder is always relevant, but also because it is relevant to his involvement in an idea to poison Germany's food supply with radioactive strontium.
Edit for correction: it happened in 1926, he was 22 years old.
The real point I should've addressed is not this tangential one but that the fact of the omission doesn't reduce the value of Rhode's telling of story of the atomic bomb at all. This HN post's existence is due to the book covering Oppenheimer which is currently a hot topic but the book is so much more than that.