The German's gave up less than three months later; the bombing worked to weaken their resolve to resist. War is hell; and the more hell the faster it ends.
“it simply strengthened their resolve to resist. Now, tell me what part worked”
Sure the people who lived through it may have hated us and been determined to fight harder...but the 20K 40K however many that died had their will to resist reduced to 0. That is the point of total war