Fiction has to be plausible. All history has to do is happen.
A horsefly can't do a horse much real damage, but it can drive it wild anyhow.
I learned by reading an awful lot and by writing a half a million words of stuff nobody would do anything with except wrap old fish.
Many things are possible. Few things are certain.
I'm a social caterpillar. I am not a social butterfly
People you don't like are pigheaded. Your friends are stubborn, or hold to their purpose.