I would have exploded the first bomb over the ocean, and only then used it against cities if Japan still hadn't surrendered. No matter how many arguments I read about this, I still can't understand the downsides of that route, besides the cost of a 'wasted bomb.'

But what's just as tragic as the bomb having been used in anger, is that it wasn't finished 2-3 years earlier -- in which case it could have saved tens of millions of lives.