It's just the WW2 version of "You were so preoccupied on whether or not you could, you didn't stop to think if you should"
Now there's lots of debate on if nukes resulted in the unsteady peace we benefit from today, but fact of the matter is two cities that existed, stopped, existing.
Edit: I'm being a bit hyperbolic but the point still stands.
I know but it's kinda the ship of theseus. It was rebuilt but for the time they got deleted.