We'll stick with WWII because dude here obviously knows all about Hitler, Stalin and what is or isn't an accurate parallel.
Propaganda is used by everyone, from freedom loving founding fathers to evil despots and dictators. The British used a god damn shitload in WWII, and some of whom was given to them via the terror bombings. But more-so to the point, they used the fact Greece repelled the completely inept Italians as a massive propaganda tool, and pushing El Douche out of Egypt too.
The truth of the matter is the Italians were arrogant and outclassed, losing due to them sucking more so than others being vastly superior. (Although the heavy tanks in Egypt were very nice, and the generals there vastly better than anything Italy had).
Didn't matter Churchill would take any and every ounce of propaganda he could to keep his people in the fight and moral high.