Granted, you could always replace the city with the catalyst of course :P
Like https://en.wikipedia.org/wiki/Atomic_gardening which is also based on randomness.
(In all seriousness, I hope we never, ever in this lifetime cause humans to suffer like we did on that day)
70,000 dying in a flash certainly puts an end to their suffering.
Like the beatles joke, "were the atomic bombs the worst atrocity of all time? They weren't even the worst of that war!"
I mean, we don't really need to rank awful things, we can acknowledge anything beyond a certain level is awful without comparing them, but lots of awful things happen without involving nukes.
Fortunately the novelty wore off fair swiftly.
The application sure, but the novelty of it being nuclear rather than conventional kept parties interested in it for quite a while!
that's debatable. like, worst single instance atrocity? possibly is