Hindsight will never be 20/20. The further back we look, the fuzzier the view gets. In looking back past our own personal experience—that journey we call “studying history”—we become strangers in a foreign land. Observing what we see there can be immensely valuable. Evaluating the effectiveness of our ancestors’ choices can enhance wisdom. Morally judging ancestors through the eyes of the 21st century, however, is a destructive misuse of hindsight.