Except for the spoiling, proteines etc provide much more "valuable" energy then fat.
Fat are pure calories, true.. but proteines fill you up better (you won't be so hungry) because they take longer to digest.
Also very valuable in the field..
Sure, someone may one day kill me with my own gun.
But they'll have to beat me to death with it because it's empty.
A computer once beat me at chess, but it was no match for me at kick boxing.