There are a lot of entrenched views being expressed here. First, Harris was carrying out the directives of his superiors, willingly of course (until he was ordered to tactical bombing pre D-Day perhaps) but part of an RAF High Command that ditched him as soon as it became expedient to do so. Second, the rival Services resented the resources directed to Bomber Command and used every opportunity to belittle its efforts. Third, you don't only achieve local air superiority by shooting down enemy planes. You simply oblige him to move them elsewhere. Where was the Luftwaffe in the main when the Red Army made its advance to Germany, when the Western Allies invaded Italy and France? In Germany! Yes of course it was countering the USAAF by day as well as Bomber Command by night, and both of them paid dearly in that bloodbath, but they ensured that Germany was successfully invaded and defeated. Without the Bomber Offensive victory would have been delayed or, worse still, denied. No amount of switching resources to the Atlantic or elsewhere would have compensated for that!