I'm not making any conspiracy theories. I was just pointing out the alternatives available.
How about using a relatively low yield nuclear weapon in any area other than thickly populated towns. Since according to you the ultimate aim of American forces was to frighten the Japanese into submission. Your military could have used atomic bombs near a Japanese military division in Japanese mainland / some mountainous area in mainland japan / or anywhere else in Japanese mainland which was not thickly populated. By doing so disastrous power of Nuclear weapons could be visible to everyone , of course with some casualties ... But American military never did that since they had a different agenda/plan. ( which is really complex).
But it's indeed true that use of Nuclear weapons ended the war before the arrival of Soviet & it in a way brought Japan under complete American influence which indirectly helped Japan to grow economically at a rapid pace with a generous American help.
The Japanese would have believe that it was all made up and American propaganda about the destructive weapon and Japan believe even after Hiroshima that we only had few to drop. Hence the dropping of 2 bombs that forced Japan to surrender, not one.