Hindsight bias
TENDENCY TO PERCEIVE PAST EVENTS AS MORE PREDICTABLE THAN THEY ACTUALLY WERE AT THE TIME
Hindsight Bias; I-knew-it-all-along effect; Hindsight; Knew-it-all-along effect; Creeping determinism; 20/20 hindsight
Hindsight bias, also known as the knew-it-all-along phenomenon or creeping determinism, is the common tendency for people to perceive past events as having been more predictable than they actually were. People often believe that after an event has occurred, they would have predicted or perhaps even would have known with a high degree of certainty what the outcome of the event would have been before the event occurred.