If much of the information we consume every day comes filtered, often biased, one-sided, or outright misleading, then imagine how worst our history has been, and will continue to be, recorded.
Unlike today, earlier societies lacked recordings, archives, and instant verification.

Historical accounts were mostly shaped by victors, elites, and those with access to power and documentation, not necessarily by those closest to the truth. 
Sometimes I wonder how history would have been told if Hitler had won World War II, imagine how much of what we take as fact would be entirely different.

Oxford historian Hugh Trevor‑Roper once wrote that “there is only the history of Europeans in Africa; the rest is darkness,” reflecting a colonial mindset that dismissed African history before European contact. This kind of narrative shaped how history was recorded and taught for decades, privileging the perspectives of colonisers over the voices of the colonised.

In many cases, history became selective and interest-driven rather than purely factual. 
As the African proverb says, "until the lion learns how to write, every story will glorify the hunter."