Short answers, pulled from the story.
Antoine Destutt de Tracy coined the term ideology between November 1793 and October 1794 while imprisoned in a Parisian cell during the Reign of Terror. He derived the word from Greek roots meaning idea and study to establish a rational science of ideas. Tracy intended the concept to defend individual liberty and property against the irrational impulses of the mob.
Napoleon Bonaparte transformed the term ideology into a pejorative insult by 1804 to describe liberal opponents as dreamy theorists disconnected from power. He labeled figures like Antoine Destutt de Tracy as fish-blooded bourgeois doctrinaires to dismiss their ideas as dangerous to his regime. This usage cemented the idea that ideology was a tool for the ruling class to control the narrative and suppress dissent.
Karl Marx defined ideology as a structural force that maintains inequality and obscures the true nature of social relations through false consciousness. He argued that the ruling class controls the means of mental production to shape the dominant ideology and justify their power. This system of consciousness arises from economic relationships and serves to perpetuate the interests of the dominant class.
Modern psychology suggests humans are ideological animals driven by motives to understand the world, avoid existential threats, and maintain interpersonal relationships. System justification theory proposes that people defend existing society to reduce uncertainty, while terror management theory suggests ideology serves as a defense mechanism against mortality. The genetic heritability of political orientation further indicates that ideological beliefs may be as much a product of biology as of culture.
Guy Debord argued that The Society of the Spectacle is a social relationship among people mediated by images where the commodity becomes the essential category of society. He claimed that the image of society propagated by the commodity describes all of life as constituted by notions and objects deriving value only as commodities tradeable in terms of exchange value. This phenomenon suggests that ideology has evolved to become a visual and cultural force that shapes human experience through the consumption of images and goods.
Eric Hoffer argued that mass movements can rise and spread without a God but never without belief in a devil to unite followers. He noted that the less satisfaction people derive from being themselves, the greater their desire to be like others, leading them to follow the example of the masses. Hoffer's analysis of the true believer suggests that ideology is a psychological state that allows individuals to escape their unwanted selves and find unity in a collective cause.