For instance, the Civ games are basically Whig History: The Game, presenting liberal capitalism as the ideal end point for all societies. It even includes uncivilized "barbarian tribes" whose sole purpose is to be exterminated so you can take their land for the glory of capitalism.
Rebellions, especially successful ones, especially ones that may change the status quo permanently, scare the ruling class too much. :porky-scared:
Yeah, it's a byproduct of who owns the video game companies. Plus they take so much funding from the Defense ghouls, they could never get too cool.