Unconditional surrender was not the only option for an end to the war. There were three days between the bombings. That's not enough time to hammer out any kind of agreement - hell that's not even enough time to confirm the devastation of the first bomb!

Hiroshima was debatable, but Nagasaki was absolutely a war crime. Between both bombings over a hundred thousand civilians were butchered (some estimates over a quarter million). Imagine all the children that burned to death in twisted shrieking agony, babies that had only been born that year turned into lumps of roasted flesh, innocent lives murdered for the sake of a battlefield test for America's toys to establish America as the new king of the world.