Which is interesting because Hiroshima and Nagasaki where both home to a majority of their military manufacturing capacity, thus, they are military targets and a large population of the civilians who lived in those cities worked in said manufacturing.
But it is civilian structures that were bombed, not the factories. Also, I don’t think factory workers are legitimate targets, although the factories certainly are. It is however a large topic and a diversion here. We have enough trouble in the present.