The data is data - bias enters the scene when silly humans assume that the data is necessarily representative, and then proceed to assert false claims based on

The data is data - bias enters the scene when silly humans assume that the data is necessarily representative, and then proceed to assert false claims based on their misunderstanding, which other humans store as "knowledge" (because distinguishing between knowledge and belief is "pedantic", "Sea-lioning", etc), and then inject new derivative false truths back into the system conversationally, through their actions, etc. Meme world.