Memory's unreliable. Memory's not perfect; it's not even that good. Ask the police about eyewitness testimony. Cops don't catch a killer by sitting around remembering stuff. They collect facts, they make notes, and they draw conclusions. Facts, not memories. That's how you investigate. Look, memory can change the shape of a room; it can change the color of a car. And memories can be distorted. They're just an interpretation, they're not a record, and they're irrelevant if you have the facts.