Reality is difficult to discern and we are not extinct. Cognitive bias has a long history of existing. For example, attributing personal flaws to harmless mistakes and attributing the flaws of others to malice or incompetence. This is clearly a distortion of reality, because we cannot assume we know the intention or capacity of all other people who aren’t perfect.

(A huge number of other evidences that sober people don’t have a full grasp of reality also exist: people misremember things all the time. People mishear things all the time. Check out that internet debate about the black-and-blue or gold-and-white dress!)