John: As I was driving to work this morning, I was stopped by a police officer and ticketed for speeding  Since there were many other cars around me that were going as fast as I was, the police officer clearly treated me unfairly  Mary: You were not treated unfairly, since the police officer was obviously unable to stop all the drivers who were speeding
Everyone who was speeding at that time and place had an equal chance of being stopped
If all of those who violate a traffic law on a particular occasion are equally likely to be penalized for violating it, then the law is fairly applied to whoever among them is then penalized.