Rationality lessons from Overwatch, a multiplayer first-person shooter:

1) Learning when you're wrong: The killcam, which shows how I died from the viewpoint of the person who killed me, often corrects my misconception of how I died. Real life needs a killcam that shows you the actual causes of your mistakes. Too bad that telling someone why they are wrong is usually considered impolite.

2) You get what you measure: Overwatch's post-game scoring gives metals for teamwork activities such as healing and shots blocked and this contributes to players' willingness to help their teammates.

3) Living in someone else's shoes: The game has several different classes of characters that have different strengths and weaknesses. Even if you rarely play a certain class, you get a lot from occasionally playing it to gain insight into how to cooperate with and defeat members of this class.