Two things: Dresden - what difference did it make wiping out a city with a few hundred bombers or one city with one plane. Secondly: Karma. Nagasaki was where the torpedoes used at Pearl Harbor were manufactured.
If Liberal's say that the response 9/11 was overkill, you could make the same argument for Pearl Harbor where fewer than 2,000 were killed.
Lastly - it was a different generation, different mores.
A good book to read on the subject is: The Making Of The Atomic Bomb by Richard Rhodes ISBN 0684813785
No, they were never intended for use in Germany. Germany’s surrender was already inevitable by April 1st and the successful crossing of the Rhine. They completely collapsed just two weeks later. Hiroshima was 5+ months later.
Trinity wasn’t conducted until July, 4 months after the crossing of the Rhine.