What is the argument that the war would have ended in a few months? Is it that the US would have reached Tokyo by then? Or Japan would have surrendered before then? Both are hard to believe
The core point of my post has not sunk in. Your personal belief does not mean that you get to confidently issued judgment on this matter, as if there are no other perspectives.
Again, this is a hotly contested issue, contested by people who in some cases, have a full-time profession in studying this issue