Coventry et al happened before those
Plus, we didn’t have the stated aim of occupying Germany by force. The moment the nazis made it clear that they intended to invade and occupy Britain, every action we took to prevent that was justified on the grounds of self defence. Bombing Dresden civilians isn’t a palatable thought, but if our top brass thought it would help our war effort than the German civilians had nobody but their own leaders to blame.
Japan had a different culture to the rest of the Axis, in that they would literally have fought until the last man. It took the horror of the bomb for the Emperor to take the unique step of ordering his generals to surrender. If that hadn’t happened, far more Japanese would ultimately have been slaughtered.
Had japan dropped the bomb on LA in an attempt to prevent greater bloodshed and then subsequently lost, do you reckon the yanks would have said “Don’t worry you were doing it for the right reasons” or would they have lined the lot of them up at Nuremberg with the Germans?
They’d already lost but constitutionally or by tradition they were unwilling or unable to formally surrender, that’s the point. Obviously if Japan and Germany had already won the war, history would have been written by them, entirely differently.