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
Fairness in the application of a traffic law is ensured not by all violators' having an equal chance of being penalized for their violation of the law, but rather by penalizing all known violators to the same extent.