They weren't exclusively civilian targets, they were considered "mixed" targets. Hirohito's home wasn't considered strategically-important enough and therefore didn't make the cut.

The sites in question were also specifically selected because they hadn't previously faced conventional attack, enabling a more accurate damage assessment.

> they hadn't previously faced conventional attack

Which, by the way, illustrates a related point: Hiroshima and Nagasaki had stiff competition. WWII was devastating, to cities and civilians all over the map. More people died in the conventional bombing of Tokyo than the atomic bombing of Hiroshima. I think the atomic bombs represented some 2 weeks worth of casualties in a war that lasted 300.

No sir that's not a school we're proposing to bomb, it's a complex containing both a school and a vehicle maintenance facility. So it's mixed, meaning there's valid logistical reasons to attack it. Yes, hundreds of children will perish in the attack, but the action will also provide us with legitimate benefits. Just try not to think about the former and focus on the latter. I'm sure no one in the future will judge us too harshly for the decision.