Based on your interpretation. Others look at the same facts and disagree.
They don't look at the same facts, and nothing I can do will make them look at them. They choose not to see them, and so they do not see them.
People want to believe the myth, and they don't want to believe that one of their heroes has feet of clay or that his cause was unjust.
They don't want to feel bad. They want to feel good, and in order to feel good they have to believe that the right thing was done for the right reasons.