It's fun to take a bunch of quotes out of context and rewrite history. However, it's not true that they dropped the bomb after they decided it wouldn't be necessary. That's a straight up lie.
Except nobody said that.
You realize both Eisenhower and Truman stated on record that they realized the nukes weren't necessary for Japan's surrender, that the emperor and cabinet both endorsed surrendering before both nukes, and that post-war analysis showed that Japan already decided to unconditionally surrender after the 1st nuke and Russian invasion?
"they realized" -> they recognized after the fact. That recognition came from post-war analysis mentioned thereafter.
Is English not your first language?