They're lucky we nuked. That ended it. We could have continued to rain napalm down on their cities, which would have been much more horrific than two nukes. The stupids can't see that. In fact I don't see Japan invasion as ever being necessary, given we had air superiority at the time. We had an air war machine that could have burnt every one of their cities to the ground. It would have taken a few more years, but the nukes ended it. They're lucky we went nuclear.