More often than not, evil is not one great shocking act. Mundane evil is the most prevalent form.. and what we come to see as great evil sometimes [usually in retrospect], starts with small tasks, and accumulates simple additions as it goes.
Ironically, I think this summarizes “Oppenheimer” – the events, and the 2023 film.

“The greatest evils in the world will not be carried out by men with guns, but by men in suits sitting behind desks.”
C.S. Lewis