Yes Carol Scientists started the Second World War to pursue their highly un-spiritual aim of making an atomic bomb.
You seem to have conveniently forgotten about the NAZI /Japanese axes trying to take over the world.
The bomb shortened the War and led to less allied troops dying. Was it justified? I don't know. Would I have made the same decision in their place? Probably.
It's a wicked world and hindsight is a wonderful thing.
PP