What arguments to be made against for using atomic weapons in the war

In WW2, the arguments against it were that it was expensive, the question of if it was humane and moral, and how many lives it would take. The arguments for it were that it would end the war quicker, more US lives would be saved, and it would save the money that a year more of war would cost.

Using atomic weapons are more forceful towards the people your fighting which can causes more death, the after effects on the environment are awfully expensive, promotes violence