Remember when you were really young and you played “let’s pretend”? What was it you pretended? Soldiers? Superheroes? Princesses?
The thing about “let’s pretend” is that it determines beliefs and actions. If you are a soldier defending your house/country/ friends/the Earth against various “baddies” then it is clear what you must do and what you must believe. You have to fight and run and hide and jump out and set traps and act fearlessly! You have to believe that everyone on YOUR side is good and everyone you are fighting against needs to be shot without question. You have to award yourself the qualities of bravery and cunning and resilience in order to fulfil your mission.