God invented the death penalty, knowing the evil in the heart of man.
God was also personally involved in those areas. He wants as many souls as possible to find their way to him and killing them closes the window of opportunity.
As far as I'm concerned, some folks just need to be killed - I'm glad I'm not the one making the decision though - I understand the story of Jonah...he also knew the evil heart of Man and tried to keep from being a part of saving some that God wanted to have him minister to.
Sometimes being a Christian Conservative will set up conflicts....