The bomber campaign inteded to make the German people surrender or even revolt against their government. This did not happen, even the destruction of whole city centers and infrastructure caused the economy to collapse, but still people did not surrender. Military targets were not always top priority, civilian targets were systematically bombed, too - namely large cities.
There were many times were bombings of aircraft fuel refineries and so on were not performed in favor of city raids - a refinery built with US help before the war was never bombed at all. It was an important one, without the substances produced there no German fighter could have get necessary fuel additions.
The infamous "Bomber Harris" is still discussed by the former Allies and Germans alike, I think intentional bombing of civilian targets is an act of terrorism and not justifiable.
Imagine Germany would not already have been down, perhaps it would not have been Hiroshima and Nagasaki but Dresden and Hiroshima?
There would of course be some myth that fanatical members of the Hitlerjugend would have killed 1.000.000 US soldiers at the minimum, this thread just reminded me of the 60 years Hiroshima thread.