To begin with, you compared all Bomber Command deaths to UK military casualties, even though substantial numbers of Bomber Command aircrew came from Canada, Australia and New Zealand, and are not included in the "British dead" figure you compared it to. You also excluded UK civilian deaths (which as most were caused by German bombing, is somewhat ironic)
Commonwealth War Graves Commission
About as legit a source as we can get. You can play around with this.
I just searched WW2 and Army, which doesn't specify nation (includes UK and all crown and commonwealth and allies fighting under British Flag).
total dead: Army 368,036, AF 124,360. Navy 65,916. Doesn't include merchant navy, civilians, miscellaneous. Doesn't specify how they died, nor by which country they belonged, either English, Scottish, Crown Colonies, or Commonwealth, nor other allies like Polish, who all fought under British command.
Narrowing it down to those serving with UK, meaning English, Scottish, Northern Ireland, etc., plus Crown Colonies, only including army, navy, air force, the three wings of the armed services, and not civilians, merchant navy, or misc., and that figure now comes out to ~353,000 total dead.
Not killed in action. TOTAL DEAD. Including accident, sickness, died of heart attack, killed themselves, etc.
RAF Bomber Command Losses of the Second World War Roll of Honour 1939-47 - amendments and additions Volume 9, Appendix 1 Casualty Statistics, p484
Now we look specifically at the composition of Bomber Command and how many died. 39,589 from RAF Bomber Command.
39,589 RAF Bomber Command deaths out of 353,000 UK armed forces deaths is 11.2%. Which is beyond the 10% required to be labeled as "decimated."
You claim that "so many resources" were not used. However you want to play this stat game, you're going to lose. The British committed a significant number of their best and brightest and wasted them in fruitless strategic bombing missions for years, with little but peripheral/incidental results, at the same time the proponents of RAF strategic bombing were flat out saying a land or sea campaign was largely worthless, as they alone would end the war. Which was total nonsense and the historical record needs to be aware of it. WW2 strategic bombing was largely a failure.