A 17-year-old has just been granted bail after killing your sister while driving a stolen car. He has ten previous cases of car theft, assault and drug possession, bailed every time. What do you do?
Nothing - let the justice system deal with it.
Break both his legs with a baseball bat and say you will be back to kill him, while ensuring that you have left no evidence behind.
Shoot him from a distance, again being careful not to get caught.
Kill him in public as a statement and take your punishment.