"The Nazis are a bunch of monsters. I intend to be just like them."
The dumbest thing the Krauts did in the Battle of Britain was switch from bombing the RAF and the early warning system to bombing London (and other cities). Their stupidity wasted resources to little military effect, and left Fighter Command free to come up and destroy them. So what did Harris do? Bombed cities. Burned out residential districts. AND IGNORED GERMAN INDUSTRY. He was wrong.