Why has the word ideology been used both positively and negatively?

The term "ideology" has functioned as both a laudatory and an abusive label since its inception during the French Revolution.1

Its positive origins lie with the philosopher A.-L.-C. Destutt de Tracy, who coined idéologie to describe a "science of ideas." For him, the term represented a noble, rational project intended to improve human life by eliminating prejudice and fostering a scientific society.12

The negative connotation emerged shortly thereafter, largely due to Napoleon. He used the term with scorn to dismiss his political opponents as impractical dreamers, blaming their influence for military failures. This established a pattern where the word could be used to disparage ideas as detached from reality or as manipulative tools.12

Later, Karl Marx further complicated the term by arguing that "ideology" often functions as a set of ideas used by a ruling class to justify exploitation and maintain power, creating a "false consciousness" among the oppressed. Today, while the term can still carry these critical or pejorative weightings, it is also frequently used in a neutral sense to describe the systematic beliefs or political philosophies held by any group.342