Half a century of Indian fighting in the West left us a legacy of cavalry tactics; but it is hard to find a serious treatise on American strategy against the Indians or Indian strategy against the whites.

The most obvious reason is that such a treatise is quite impossible to write without blatantly contradicting the Official Truth.

Not a unique situation. USSR solved a similar problem via having large body of secret military literature.
Of course, as much as discovering the very existence of secret historical literature immediately reveals the official story of the relevant period as mostly fake. Which can be somewhat shocking for the people who already have clearance at least for a relevant catalogue. Thus occasionally backfired — well, isegoria has one of those officers in the tags. =)

“Strategic bombing” of enemy homelands was also occasionally rationalized in terms of [...]
It was also rationalized in more “military” terms, as a way of selectively denying war material to the troops or as a way of generally weakening the economy on which the military effort rested.

And sometimes «blame Liddell Hart for predicting it, we have read about this and felt compelled to run with it, it’s, like, demonic possession, man».

just as the German buzz bombs and V-2 rockets can be thought of as coercive instruments to get the war stopped before suffering military defeat.

In other words, sometimes it was aimed at military industry, but the rest was just British habitual ghoulishness (per Marie Stopes — «Catholics and Prussians, The Jews and the Russians» etc etc) on the one side of La Manche, and a misguided attempt at deterrence on the other… as acknowledged and mocked by J.M. Spaight in https://archive.org/details/BombingVindicated_201711

Speaking of which, what’s with this foggy «can be thought of»? Both sides plainly agreed on its purpose. Also, ahem, it did not work. The losing side used up its resources inefficiently, and that was that.

Goes back earlier, to the French Revolution.

Have you read “The Psychology of Military Incompetence” by Norman Davies? A bit dated but more historically informed.