Hindsight Bias
Hindsight Bias is the tendency to perceive past events as having been predictable or inevitable after they have occurred — the "I knew it all along" phenomenon. Documented by Baruch Fischhoff (1975), it systematically distorts learning from experience by making outcomes seem more foreseeable than they were, reducing accountability for poor decisions, and making past decision-makers look either brilliant or foolish based solely on how things turned out.