I just wanted to show context of the decision: normal routine of invasion which meant similar collateral losses on every island and every town (bearing in mind kamikaze squadrons, Okinawa's suicidal deaths) till Tokio plus daily bombardings of main cities or 2 severe strikes.
I dont know why some humanes dont find it as humane gesture...
Japanese only victims on just 2 japanese islands before mainland:
- Iwo Jima - 21,000 military
- Okinawa - 100,000 military, 150,000 civilians (mostly suicidal)