Why is school education whitewashed? Why don't we as people tell the truth? That Columbus was no good and Lincoln was a murderer?

Throughout his years in the New World, Columbus enacted policies of forced labor in which natives were put to work for the sake of profits. Later, Columbus sent thousands of peaceful Taino “Indians” from the island of Hispaniola to Spain to be sold. Many died en route.

can i get brainliest.