Don't kill a person, people will flame you and end up killing you and your rep.
Rules:
If criminal action is being caused by someone of a different race, you must call a police officer of the same race to come stop it.
If you are being assaulted, ask them nicely to stop. If they don't stop, ask again. If they are about to kill you, tough cookies.
If you use your gun, you lose your job, reputation, respect, and personal safety. You might wake up tomorrow to find your family murdered.