I can remember countless stories of the Old Testament of wars, disputes and general bloodletting that would make the South African Blood River look like a little picnic. It also speaks of God's direct intervention to reduce the load on Planet Earth. Based on the very specific commands given, I reckon if we can round up a few True Christians to actually follow the Bible, we will make the planet a more habitable one. So, based on God's commands and his infallible guide to living, here is a list of people that we are authorised to … well KILL.
Kill Homosexuals
"If a man lies with a male as with a women, both of them shall be put to death for their abominable deed; they have forfeited their lives." (Leviticus 20:13 NAB)

Kill Fortunetellers

A man or a woman who acts as a medium or fortuneteller shall be put to death by stoning; they have no one but themselves to blame for their death. (Leviticus 20:27 NAB)

Death for Hitting Dad

Whoever strikes his father or mother shall be put to death. (Exodus 21:15 NAB)

Death to Followers of Other Religions

Whoever sacrifices to any god, except the Lord alone, shall be doomed. (Exodus 22:19 NAB)