Don't kill people
killing people is very bad, and illegal
Rule number one: Life imprisonment- Life imprisonment is used as a means of avoiding the death penalty while still dealing out a punishment.
Rule number two: Shunning- If you commit a murder, you are forever branded as a horrible person. You are shunned by most people, and anyone can go and look up your criminal record. This is to discourage people from killing.
History and Relevance
Killing people has been forbidden since the time of Hammurabi's code, the first set of laws ever to exist. This law exists to keep the peace, and keep people from descending into total chaos. It is still relevant today, and all over the world.