have. You've got absolutely no idea how changing one single action in a big, complicated series of interconnected actions affects all the others. 

Maybe BYU goes on and wins by 30 without the pick-6. Maybe BYU gets complacent and Utah's offense takes a totally different approach that yields more points. Maybe Utah feels more pressure and kicks an onside kick after they score their next TD. The pick 6 wasn't even in the 4th quarter - there was still almost half the game to play when it happened.