Anarchy,
You should know that shortly after Noah and his family left the ark, God ordained capital punishment for murderers (Genesis 9:5-6).
Capital punishment requires a human government agency to investigate the murder, and then apprehend and try the murderer, and administer the sentence of execution. God commanded that the murderer’s blood be shed by mankind. Thus, when God ordained capital punishment, He thereby instituted human government as a further restraint against the lawless rebellion of mankind. In Romans 13:1-7 the Apostle Paul indicated that human governmental authority derives its existence from God, that it was ordained for the purpose of restraining evil, and that it functions as the minister of God when it administers capital punishment.
So yes, do not kill . But just in the off chance that someone else may not live by that ... well you know the rest.