There was also the fear widely believed OTL of the knock out blow which led the British government to order over a million card board coffins to bury the dead caused by air oak bombing.
AFAIK/IIRC that was one reason why IOTL the British Government concentrated on the largest possible bomber force in the pre-war expansion schemes. It wanted to deter Germany from bombing the UK using the fear of retaliation by the would be RAF Bomber Command. It was effectively Mutual Assured Destruction without atom bombs.
The First Report of the Defence Requirements Committee which was published in 1934 recommended building up the RAF in the Far East and expanding the Fleet Air Arm to "show a tooth" to the Japanese. However, for the home based RAF the same report only recommended completing the scheme for a Home Defence Force of 594 fighters and bombers in 52 squadrons that had been approved in 1923 for completion in 1928, but the completion date had been put back to 1938.
However, Scheme A approved in July 1934 only approved the addition of one squadron in the Far East over those already approved and 42 extra aircraft for the FAA over the currently approved total of 171 (or 174). Meanwhile the Home Defence Force was to be expanded from the 448 fighters and bombers in 39 squadrons in March 1934 to 836 fighters and bombers in 71 squadrons by 31st March 1939. Though it also increased the would be Coastal Command from 15 aircraft in 4 squadrons in March 1934 to 64 aircraft in 8 squadrons by March 1939.
Scheme C approved in May 1935 (IIRC in response to the Luftwaffe "coming out" earlier in the year) was for 1,260 fighters and bombers in 105 squadrons in the Home Defence Force by 31st March 1937. There was no change to the FAA and overseas commands whose completion date was still 31st March 1939, but it did include more general reconnaissance and army co-operation aircraft in the UK. AFAIK the bomber force approved in the scheme was to match the bomber force the Luftwaffe was expected to have in 1937.
Scheme F approved in February 1936 increased the Home Defence Force to 1,422 fighters and bombers in 100 squadrons by 31st March 1939. However, the number of fighters remained the same at 420 (in 30 squadrons of 14 instead of 35 of 12). Again the increase from 840 to 1,022 bombers was to match the number of bombers the Luftwaffe was expected to have in 1939. This scheme approved the formation of the squadrons for the Far East originally proposed by the First D.R.C. Report plus an expansion of the FAA from the 159 (or 162) that existed in March 1934 to 312 by March 1939 and 504 by March 1942. It also approved a big increase in the number of reserve aircraft so that the RAF could maintain it's first-line strength while the aircraft industry was put on a war footing, the Shadow Factory Scheme to build them and the formation of the Royal Air Force Volunteer Reserve to provide the aircrew.
Scheme H proposed in January 1937 (but not approved) was a reaction to an upward revision of the number of bombers the Luftwaffe was expected to have in 1939. The Home Defence Force under that scheme was to have 2,065 fighters and bombers in 119 squadrons by March 1939, with a further expansion to 2,135 fighters and bombers in 124 squadrons as soon as possible afterwards. As it wasn't possible to increase the production of aircraft and aircrew by March 1939 some of the increase over Scheme F was to be achieved by delaying the formation of the 10 overseas squadrons approved in Scheme F.
It wasn't just the RAF and British Government that were obsessed with strategic bombing the Alexander Korda film Things to Come, which was written by H.G. Wells, begins with an air raid on "Everytown."