It's good to report people that steal your things.
John was in the gym when he saw another guy going through his locker.
John wants to get his things back.
John immediately reports what the other guy is doing to the gym owner.
John starts to beat the other guy up in order to get his things back.
John gets his things back from the gym owner, and he is given a free month membership for his trouble.
The owner of the gym bans John from using the gym's facilities for a year.