why drop the nukes when they can just bomb the manufacturing hubs without incurring as much civilian death
That’s just it, they had been, for quite a while, but the Japanese would not capitulate.
So just bombing military targets with regular ordinance wasn’t enough. The type of bombing was a signal and a message in and of itself.
That’s not my understanding at all, only just that having witnesses was a side effect, but not the primary reason.
From what I remember from watching documentaries there were military targets in the cities, I think (don’t hold me to it) bomb making factories.
Feel free to pass on some links if you know otherwise, as history is always a learning experience.(See edit below.)Edit: Looking at the Wiki page, under the section about targeting, it mentions this about Hiroshima…
… and…
The wiki article does mention what you’re stating as well, so in essence we’re both right, though I would still argue that the military objective was primary, and the spectacle as you call it was secondary, even if it was a close secondary.