I'm looking for what to call this... What if you know that something bad is going to happen to someone, but you don't warn them because it is supposed to happen. Like, you could warn someone of a car accident, but you don't because it led to an xray that warned them about bone cancer. Or you see that someone will die, but if they don't die the Nazis win the war. Or someone becoming a martyr inspires something greater than their life would be. Or you tell someone to take a vacation, knowing that they would get into a plane crash by going. But they buy the seat and prevent someone important from being there.